At What Age Do You Stop Growing Taller

Most people stop growing taller by age 16 for girls and age 18 for boys, though some males continue adding height until age 21. Growth ends when the growth plates (also called epiphyseal plates, the areas of developing cartilage near the ends of long bones) permanently close after puberty.

The Biological Clock Behind Height Growth

Height growth stops permanently when the growth plates close. Growth plates are zones of soft cartilage tissue located near the ends of your long bones, such as the femur (thighbone) and tibia (shinbone), that allow bones to lengthen during childhood and adolescence. Once these plates harden into solid bone, no further height increase is possible regardless of diet, exercise, or supplements.

The closing of growth plates is triggered by rising levels of sex hormones, specifically estrogen and testosterone, that flood the body during puberty. This hormonal surge first accelerates growth, then permanently shuts it down.

Girls vs. Boys: A Side-by-Side Comparison

Girls stop growing earlier than boys because puberty begins 1 to 2 years sooner in females, which means their growth plates close at a younger age.

Boys often appear to “catch up” and surpass girls in their mid-teens because their growth window stays open longer, giving them more time to accumulate height overall.

What Are Growth Plates and Why Do They Matter?

Growth plates are the single biological mechanism that controls when height stops, making them the most important factor in understanding the end of growth. Each long bone contains two growth plates, one at each end, and the body has about 26 separate growth plate sites in total.

A pediatric radiologist can assess bone age (the biological maturity of the skeleton, as distinct from a person’s calendar age) by taking an X-ray of the left hand and wrist and comparing it against the Greulich-Pyle atlas (a standardized reference chart of skeletal development stages). If bone age is advanced beyond calendar age, growth may end sooner than average.

• Enter your Date of Birth Start. Current Age. 0. This is how fast your age is moving. Time is the most valuable thing a man can spend.

Once all growth plates close, bone tissue is fully calcified and height is locked in permanently. No amount of stretching, hanging from a bar, or taking supplements can reopen closed growth plates.

The 5 Key Factors That Determine Your Final Height

Five factors work together to set final adult height, which explains why two siblings raised in the same home can end up meaningfully different in stature.

1. Genetics accounts for approximately 60 to 80 percent of your final height. The mid-parental height formula (a calculation using both parents’ heights to predict a child’s likely adult height) is the most commonly used clinical tool for estimating growth potential.
2. Nutrition during childhood and adolescence determines whether a person reaches their genetic height ceiling. Chronic deficiencies in calcium, vitamin D, and protein can permanently stunt growth.
3. Sleep drives height gain because the body releases the majority of human growth hormone (HGH), the primary chemical signal that drives bone lengthening, during deep slow-wave sleep.
4. Physical activity with weight-bearing exercise supports healthy bone density and may modestly optimize growth during adolescence.
5. Underlying medical conditions such as hypothyroidism (underactive thyroid gland), celiac disease (an autoimmune disorder triggered by gluten), or growth hormone deficiency can meaningfully reduce final height if left untreated.

How to Estimate Your Child’s Adult Height

The mid-parental height formula is the standard clinical method pediatricians use to predict a child’s likely adult height, and the calculation differs by sex.

For boys: Add both parents’ heights in inches, add 5 inches, then divide by 2.

For girls: Add both parents’ heights in inches, subtract 5 inches, then divide by 2.

This estimate carries a margin of error of roughly plus or minus 2 inches in either direction. A child who consistently falls far outside this predicted range warrants evaluation by a pediatric endocrinologist (a doctor who specializes in hormonal and growth disorders).

Growth Spurts: When Height Increases Fastest

The puberty growth spurt is the single fastest period of height gain in a person’s life, typically lasting anywhere from 6 months to 2 years.

Outside of the puberty growth spurt, children grow at a slower baseline rate of approximately 2 to 2.5 inches per year throughout middle childhood, roughly ages 3 to 10.

Average Height by Age: What Is Normal for Boys and Girls?

CDC growth chart data at the 50th percentile (the median, meaning half of children are taller and half are shorter) provides the following typical height values for children and adolescents in the United States.

Girls’ average height plateaus around age 14 to 15, while boys continue increasing through age 17 to 18. A child falling between the 5th and 95th percentile for their age and sex is generally considered within the normal range by pediatric standards.

How to Tell If You Are Still Growing

Shoe size still increasing is one of the most reliable practical signs that height growth is ongoing, since the bones of the feet close on a similar developmental timeline to the long bones of the legs. Additional reliable indicators include:

• Clothing length keeps increasing. Inseam and sleeve length going up without significant weight gain indicates active bone lengthening.
• Puberty is still in progress. If signs such as voice deepening in boys or breast development in girls are still occurring, the growth window is almost certainly still open.
• Height measurements show recent change. Tracking height every 3 to 6 months with a wall stadiometer (a fixed vertical measuring device that gives accurate, reproducible readings) confirms whether growth is still happening.
• A bone age X-ray shows open plates. A radiologist compares wrist and hand bones against the Greulich-Pyle atlas to confirm whether any growth plates remain active. This is the only definitive clinical method.

There is no blood test that directly confirms whether growth plates are open. Imaging remains the only medical standard for assessing remaining growth potential.

Does Weightlifting Stunt Growth in Teenagers?

Weightlifting does not stunt growth in teenagers when performed with proper form, appropriate loads, and adult supervision. The American Academy of Pediatrics and the National Strength and Conditioning Association both explicitly support supervised resistance training for adolescents as safe when programmed correctly.

The concern historically centered on the idea that heavy loads could compress or damage open growth plate cartilage. Research does not support this as a general risk from proper training. The real danger is injury from poor technique or maximal lift attempts without adult oversight.

Does Caffeine Stunt Growth?

Caffeine does not directly stunt growth, and no clinical evidence supports the claim that drinking coffee or caffeinated drinks reduces final adult height. The American Academy of Pediatrics does not list caffeine as a cause of reduced stature.

The myth likely originated from older research that incorrectly linked caffeine to osteoporosis (a weakening of bone density over time). While very high caffeine intake can slightly reduce calcium absorption, the effect is too small to meaningfully impact growth in children consuming adequate calcium through diet.

The genuine concern is that caffeine disrupts sleep quality. Because human growth hormone is predominantly released during deep sleep, anything that degrades sleep architecture can indirectly reduce the hormonal signals that support height gain. The mechanism is sleep disruption, not caffeine acting directly on bones.

Can You Grow Taller After 18?

Growing taller after age 18 is uncommon for women and possible but unlikely for most men. A small percentage of males with late-closing growth plates continue gaining height through their early 20s, sometimes as late as age 21 or 22.

Adults with open growth plates are detectable only through imaging. There is no reliable way to tell from appearance alone whether growth plates are still active. Any claim that a pill, device, or exercise program can increase adult height after the growth plates have closed is not supported by clinical evidence.

Rare medical conditions such as acromegaly (excess growth hormone production in adulthood caused by a pituitary tumor) can cause abnormal bone growth in adults, but this produces thickening of bones rather than the healthy height gain that occurs during adolescence.

Posture, Spinal Decompression, and Perceived Height

Improving posture can make a person appear 0.5 to 2 inches taller without any change in actual bone length. Poor posture caused by forward head position, rounded shoulders, or a curved spine compresses the body’s vertical silhouette and makes a person look shorter than their skeleton actually measures.

Humans are typically 0.5 to 0.75 inches shorter at the end of the day than in the morning due to spinal compression from being upright. This height is restored after lying down overnight. Activities like swimming and yoga that decompress the spine can help maintain full standing height across the day.

Scoliosis (an abnormal sideways curvature of the spine) can reduce measurable standing height by compressing the torso. Treating scoliosis in adolescence through bracing or surgery can in some cases result in a measurable increase in standing height by straightening the spinal column, though this represents correcting a deformity rather than generating new bone growth.

HGH Therapy: Can Doctors Make You Grow Taller?

HGH therapy can meaningfully increase final adult height in children with specific diagnosed medical conditions, but only while growth plates remain open. The FDA has approved synthetic HGH treatment for growth hormone deficiency, Turner syndrome (a chromosomal condition in females that causes short stature), Prader-Willi syndrome, and children who are small for gestational age (born significantly smaller than expected for their gestational age at delivery).

Children with confirmed growth hormone deficiency who begin HGH therapy early can gain 1 to 3 additional inches of adult height compared to no treatment. The earlier treatment begins, the greater the potential benefit.

HGH therapy does not increase height in adults with closed growth plates. Over-the-counter products marketed as “HGH supplements” claiming to increase height in adults are not regulated as drugs and have no proven effect on stature.

Height After 20: Is Any Growth Still Possible for Men?

Less than 5 percent of men continue gaining height past age 20, typically those with constitutionally delayed puberty (a pattern of late-starting but otherwise normal pubertal development that frequently runs in families), where the entire developmental timeline is shifted later.

For the vast majority of males, height is fully fixed by age 18 to 19. Any perceived height increase reported by men in their 20s without imaging confirmation is more likely explained by improved posture, more accurate measurement technique, or normal day-to-day height variation of up to 0.75 inches due to spinal compression.

Limb lengthening surgery (a surgical procedure that fractures the leg bones and gradually separates them using an external frame or internal rod to stimulate new bone growth in the gap) is the only proven method of increasing height in adults with closed growth plates. It is invasive and carries significant recovery requirements, typically reserved for limb length discrepancies (a meaningful difference in length between the two legs) or specific medical indications rather than cosmetic height increase.

How Height Varies by Ethnicity in the United States

Average adult height differs by ethnic group in the United States, reflecting a combination of genetic ancestry and socioeconomic factors that affect nutrition and healthcare access across generations.

These figures represent population averages with wide individual variation. Genetics inherited from ancestors across generations is the primary driver of these differences, while access to adequate childhood nutrition also plays a meaningful role at the population level.

Average Height by Country: How the US Compares Globally

The United States ranks in the middle tier globally for average adult height, with Northern and Central European countries consistently ranking among the tallest populations in the world.

The Netherlands has held the top position for average male height for several decades. Research published in eLife Sciences attributes the height of Dutch men partly to natural selection, as taller men in the Netherlands historically had more children who survived to adulthood than shorter men, reinforcing height genes across generations.

Average national height has increased significantly over the past 150 years across most countries, a trend researchers attribute primarily to improvements in childhood nutrition, reduced disease burden, and better access to healthcare rather than genetic change.

Is 5’9 Tall for a Man? A Height Percentile Reference

Whether a specific height is considered tall, average, or short depends entirely on the population being compared against. The following table shows where common heights fall in the US male and female adult distributions.

For adult men in the United States:

For adult women in the United States:

A height of 5 ft 9 in is exactly average for American men but would place a woman at approximately the 99th percentile, meaning taller than roughly 99 out of 100 adult women in the United States.

Sleep, Nutrition, and Exercise: What Actually Maximizes Height During the Growth Years

Adequate sleep is the single most impactful lifestyle habit for maximizing height during the growth years, because human growth hormone is released almost entirely during deep slow-wave sleep. The American Academy of Sleep Medicine recommends 9 to 11 hours per night for school-age children and 8 to 10 hours for teenagers. Chronic sleep deprivation directly suppresses the hormonal signals that drive height gain.

Calcium and Vitamin D work together to build dense, strong bones. The recommended daily intake for adolescents is 1,300 milligrams of calcium and 600 IU of Vitamin D, sourced from dairy products, leafy greens, fortified foods, fatty fish, and sunlight exposure.

Protein supplies the amino acids required to build bone and muscle tissue. Adolescents generally need 0.85 to 1 gram of protein per kilogram of body weight per day to support healthy growth.

Avoiding tobacco and alcohol during adolescence is medically significant. Both substances are linked in research to reduced bone density and suppressed growth hormone secretion during developmental years.

When to See a Doctor About Your Child’s Height

A child who falls below the 3rd percentile on standardized CDC growth charts for their age and sex warrants medical evaluation, as this falls outside the range considered typical by pediatric standards.

Additional reasons to consult a pediatrician or pediatric endocrinologist include:

• Height growth has slowed or stopped for more than 6 months before the expected end of puberty
• A child is significantly shorter than both parents’ predicted heights suggest
• Puberty begins before age 8 in girls or before age 9 in boys (precocious puberty, meaning puberty that starts abnormally early relative to population norms)
• Growth hormone deficiency is suspected based on very slow growth rate and small stature relative to peers

Conditions like growth hormone deficiency are treatable with synthetic HGH therapy when diagnosed early, and early intervention can meaningfully improve final adult height outcomes.

The Role of Genetics: Can You Outgrow Your Parents?

Genetics sets a probable height range rather than a fixed ceiling, making it entirely possible for a child to be several inches taller than both parents given optimal nutrition, sleep, and health throughout childhood. Twin studies consistently show genetics explains approximately 60 to 80 percent of height differences between individuals, leaving 20 to 40 percent attributable to controllable environmental factors.

Regression to the mean (the statistical tendency for extreme parental traits to produce offspring closer to the population average) also explains why very tall parents often have children slightly shorter than themselves, and very short parents often have children slightly taller.

Frequently Asked Questions

At what age do most girls stop growing taller?

Most girls stop growing taller between ages 14 and 16, after their growth plates close following the puberty growth spurt. Girls typically experience their fastest height gain around age 12, and growth begins winding down within 1 to 2 years after their first menstrual period.

At what age do most boys stop growing taller?

Most boys stop growing taller between ages 16 and 18, though some continue gaining height until age 21. Boys generally experience their peak growth spurt around ages 13 to 14, adding as much as 3 to 4 inches per year during that phase before growth gradually slows and stops.

Can you grow taller after 18?

Growing taller after age 18 is rare but not impossible, particularly for males whose growth plates may not fully close until their early 20s. Once growth plates are confirmed closed through an X-ray, no further natural height increase can occur regardless of supplements, exercises, or diet changes.

How many inches do boys grow after 16?

Most boys grow 1 to 2 more inches after age 16, with growth tapering off between ages 17 and 18. Boys who are late developers may still be in the middle of their main growth spurt at 16, potentially adding 2 to 4 more inches before their growth plates fully close.

How many inches do girls grow after 14?

Most girls grow less than 1 to 2 inches after age 14, as the majority of female height gain is typically complete by this point. Girls who had a later puberty onset may still have a small amount of growth remaining, but significant height gains after 14 are uncommon for females.

Can a 20-year-old still grow taller?

Growing taller at age 20 is possible for less than 5 percent of males, specifically those with unusually late-closing growth plates. For women and most men, height is already fixed by age 20. The only way to confirm whether growth is still possible is through a bone age X-ray.

How do I know if I am done growing?

The most reliable signs that height growth has stopped include shoe size unchanged for over a year, height measurements stable for 6 to 12 months, and puberty fully complete. An X-ray of the hand and wrist can definitively confirm whether growth plates have closed, which is the medical standard for determining whether height growth has ended.

Does stretching or hanging make you taller?

Stretching and hanging exercises do not increase height after growth plates have closed. These activities can temporarily improve posture, making a person appear slightly taller by 0.5 to 1 inch, but they do not stimulate bone growth or reopen sealed growth plates.

Does weightlifting stunt your growth?

Weightlifting does not stunt growth when performed with proper form and appropriate weight loads. The American Academy of Pediatrics supports supervised resistance training for teenagers as safe and beneficial. The risk comes from poor technique or maximal lift attempts without supervision, which can stress still-developing growth plate cartilage.

Does coffee or caffeine stunt your growth?

Caffeine does not directly stunt height growth, and no clinical evidence supports the claim that drinking coffee reduces final adult height. The concern is that caffeine can disrupt sleep quality, and because human growth hormone is primarily released during deep sleep, chronic sleep disruption from caffeine use can indirectly reduce the hormonal environment needed for optimal growth.

How much does genetics affect how tall you will be?

Genetics accounts for approximately 60 to 80 percent of an individual’s final height. The remaining 20 to 40 percent is influenced by nutrition, sleep quality, physical activity, and overall health during the growing years. This is why two people with the same parents can still differ by several inches.

Can poor nutrition permanently stunt height?

Yes. Chronic malnutrition during childhood and adolescence, particularly deficiencies in protein, calcium, and vitamin D, can permanently reduce final adult height by preventing a child from reaching their full genetic growth potential. This effect is most pronounced in the first 3 years of life and during the adolescent growth spurt.

What is a growth plate and when does it close?

A growth plate (also called an epiphyseal plate) is an area of actively dividing cartilage cells near the ends of long bones that allows bones to lengthen during development. Growth plates typically close in girls by ages 14 to 16 and in boys by ages 16 to 18, at which point they harden into solid bone and height becomes fixed.

At what age do growth plates close?

Growth plates typically close between ages 14 and 16 in girls and ages 16 and 18 in boys, though timing varies by individual and by which specific bone is assessed. Some growth plates in the spine and pelvis close slightly later than those in the limbs. A bone age X-ray is the standard diagnostic tool for confirming closure.

Do late bloomers grow taller than average?

Late bloomers, meaning people whose puberty starts later than typical, often experience their growth spurt at an older age but generally reach a similar final height as their peers. Late puberty delays the timeline but does not by itself guarantee a taller outcome, since final height is primarily determined by genetics and overall bone development.

Is it normal for a 15-year-old boy to not have had a growth spurt yet?

Yes. A 15-year-old boy who has not yet had a significant growth spurt may simply be a late developer with constitutionally delayed puberty, meaning puberty is starting later than average but will otherwise proceed normally. This pattern frequently runs in families. If puberty shows no signs at all by age 14, a pediatric evaluation is recommended to rule out underlying causes.

Is it normal for a 16-year-old boy to still be growing?

Yes, it is completely normal for 16-year-old boys to still be actively growing, as most males do not reach their final height until ages 17 to 18, with some continuing until age 21. If growth seems unusually slow or appears to have stopped well before expected, a visit to a pediatric endocrinologist is a reasonable next step.

Can you grow taller at 17?

Yes, growing taller at 17 is completely normal, particularly for boys. Most males are still actively growing at age 17 and will continue until age 18 or later. Girls are less likely to be adding significant height at 17 but may have a small amount of growth remaining. Both sexes can confirm active growth through consistent measurements tracked over 3 to 6 month intervals.

What is the average height for a 13-year-old boy?

The average height for a 13-year-old boy in the United States is approximately 5 feet 1.5 inches, according to CDC growth charts at the 50th percentile. At this age, many boys are in the early-to-mid phase of their puberty growth spurt and will add significantly more height over the next 2 to 4 years.

What is the average height for a 14-year-old girl?

The average height for a 14-year-old girl in the United States is approximately 5 feet 3 inches, based on CDC growth chart data at the 50th percentile. Most girls are close to or at their final adult height by age 14 to 15, having already completed the majority of their puberty growth spurt.

What foods help you grow taller during puberty?

Foods that support optimal height growth during puberty include dairy products rich in calcium, lean proteins such as chicken, eggs, and legumes, fatty fish containing vitamin D, and leafy green vegetables. Meeting the recommended intake of 1,300 milligrams of calcium and 600 IU of vitamin D daily is particularly important for bone development during the adolescent growth years.

How much taller will I get after starting my period?

Most girls grow 2 to 3 more inches after their first menstrual period (menarche), with the majority of remaining growth occurring in the 1 to 2 years immediately following. The onset of menstruation signals the peak growth spurt has already passed, and growth typically slows substantially within 1 to 1.5 years of the first period.

Can scoliosis make you shorter?

Yes. Scoliosis (an abnormal sideways curvature of the spine) can reduce measurable standing height by compressing the torso and creating a non-vertical spinal column. The more severe the curvature, the greater the height loss. Treating scoliosis in adolescence through bracing or surgery can in some cases result in a measurable increase in standing height.

Does posture affect how tall you are?

Posture affects how tall a person appears by up to 0.5 to 2 inches but does not change actual bone length. Slouching, forward head posture, and rounded shoulders make a person look shorter. Improving posture restores the full height the skeleton allows but does not add height beyond what the bones already measure.

Can you increase height after your growth plates close?

Once growth plates are confirmed closed, natural height increase through bone growth is not possible. The only medically proven option for adults is limb lengthening surgery, which is invasive and typically reserved for medical indications rather than cosmetic height increase. Posture improvement can make a person appear taller by 0.5 to 2 inches without any skeletal change.

Does HGH therapy work for increasing height in adults?

HGH therapy does not increase height in adults whose growth plates have already closed, because there is no active cartilage for the hormone to act on. It is effective only in children and adolescents with confirmed growth hormone deficiency or other specific medical conditions while growth plates remain open. In adults, off-label HGH use carries significant health risks and is not FDA-approved for height increase.

Why am I not growing as tall as my parents?

Falling short of one parent’s height is normal and does not necessarily indicate a problem, since the mid-parental height formula accounts for both parents and carries a margin of error of plus or minus 2 inches. If height is significantly below what both parents’ heights predict, factors such as chronic poor nutrition, inadequate sleep, an undiagnosed medical condition, or early growth plate closure may be responsible.

Do tall parents always have tall children?

Tall parents significantly increase the probability of tall children but do not guarantee it. Regression to the mean (the statistical tendency for extreme parental traits to produce offspring closer to the population average) means very tall parents often have children slightly shorter than themselves, and very short parents often have children slightly taller.

Does swimming make you taller?

Swimming does not make you taller by stimulating bone growth, but it is excellent for spinal health and posture because the horizontal position and buoyancy reduce gravitational compression on the spine during exercise. The claim that swimming permanently stretches the spine and adds height is not supported by research.

How much does sleep affect height growth?

Sleep has a direct and significant effect on height growth because the majority of human growth hormone is released during deep slow-wave sleep. Children who chronically sleep fewer than the recommended 9 to 11 hours per night produce less growth hormone over time, which can reduce the hormonal environment needed to support full genetic height potential during the growth years.

Is 5’9 tall for a man?

5 feet 9 inches is the average height for adult men in the United States, placing it at the 50th percentile, meaning half of American men are taller and half are shorter. Globally, 5’9 is above average, as the worldwide mean for adult males is closer to 5 feet 7 inches (171 cm). Whether 5’9 is considered tall depends entirely on the country and population being referenced.

Is 5’7 short for a man?

5 feet 7 inches falls at approximately the 20th percentile for adult men in the United States, meaning about 80 percent of American men are taller. It is below average in the US but sits near or above the national average in many countries including Japan, China, and most of Southeast Asia and Latin America.

Is 5’4 tall for a woman?

5 feet 4 inches is the average height for adult women in the United States, placing it at the 50th percentile. It is considered average, not tall, for American women. A woman would need to be approximately 5 feet 6 inches or taller to be considered meaningfully above average in the United States, reaching the 85th percentile or higher.

Is 6 feet tall for a man?

6 feet tall places an American man at approximately the 90th percentile, meaning taller than about 9 in 10 adult men in the United States. It is widely considered tall in the US context. In the Netherlands, however, where the average male height is 6 feet (183 cm), the same height is simply average.

What is the tallest country in the world?

The Netherlands consistently ranks as the tallest country in the world for average male height, with Dutch men averaging approximately 6 feet 0 inches (183 cm). For women, the Netherlands and Latvia rank among the tallest globally, with averages around 5 feet 7 inches (170 cm). Researchers attribute the Netherlands’ exceptional average height to a combination of favorable genetics, high-quality childhood nutrition, and universal access to healthcare across generations.

What is the average height in the United States?

The average height in the United States is 5 feet 9 inches (175 cm) for adult men and 5 feet 4 inches (162 cm) for adult women, based on CDC National Health Statistics data. These averages have increased by roughly 1 inch over the past century, primarily due to improvements in childhood nutrition and reductions in infectious disease during the growth years.

How tall is tall for a woman in the US?

A woman is generally considered tall in the United States at 5 feet 6 inches (168 cm) or above, which places her at the 85th percentile or higher. At 5 feet 8 inches, a woman is at approximately the 97th percentile for American women, taller than the vast majority of the female population. At 5 feet 9 inches or above, she would be in the top 1 percent of American women by height.

Why are Dutch people so tall?

Dutch people are exceptionally tall due to a combination of genetics, optimal childhood nutrition including high dairy consumption, universal healthcare access, and natural selection over generations. Research has found that taller Dutch men historically had more surviving children than shorter men, gradually increasing the prevalence of height-associated genes in the population. The average Dutch male height of 6 feet (183 cm) is among the highest ever recorded for a national population.