Most 17-year-olds still have some growing left to do, though how much depends heavily on sex, puberty timing, and genetics. Boys at 17 are frequently still adding height, while many girls are at or near their final stature. The difference comes down to growth plates, the strips of cartilage near the ends of long bones that gradually harden and close as puberty winds down. Whether yours are still open at 17 is something that can actually be measured, and the answer is more individual than any age-based rule of thumb can capture.
What Growth Plates Are and Why They Matter
Your height comes from the lengthening of long bones in your legs, spine, and arms. That lengthening happens at growth plates, thin layers of cartilage sandwiched between the shaft and the rounded ends of each bone. Cells in these plates divide, stack up, and eventually get replaced by hard bone. As long as this cycle keeps running, you keep getting taller.
Growth plates have distinct zones, each doing a different job. Stem-like cells in a “resting zone” feed fresh cartilage cells into a “proliferative zone,” where rapid division occurs. Those cells then enlarge in a “hypertrophic zone,” and finally get replaced by actual bone tissue through a process of calcification and blood vessel invasion. When the supply of fresh cartilage cells runs out and the entire plate turns to bone, the plate is said to be “fused” or “closed,” and growth at that site is permanently finished.1PubMed Central. Growth plate closure and therapeutic interventions
This is why growth is a one-way door. Once a plate fuses, no amount of exercise, nutrition, or supplementation can reopen it. The cartilage is gone, replaced by solid bone. That biological reality is the foundation for everything else in this article.
Estrogen Is the Real Clock
You might assume testosterone drives the timing of growth plate closure in boys and estrogen does the same in girls. The reality is simpler and stranger: estrogen is the primary signal that closes growth plates in both sexes. Boys produce estrogen too, in smaller amounts, by converting testosterone through an enzyme called aromatase. The rising estrogen levels that accompany puberty first stimulate a growth spurt and then, once they reach a certain threshold, trigger the plates to fuse.2The Journal of Steroid Biochemistry and Molecular Biology. Estrogens and human growth
Some of the strongest evidence for estrogen’s role comes from rare genetic conditions. Men who lack a functioning estrogen receptor, or who cannot produce estrogen at all due to an aromatase deficiency, never fully close their growth plates, even well into adulthood. Their bones just keep growing slowly, which sounds advantageous until you consider the skeletal problems that come with it. These cases confirm that without estrogen, the signal to stop growing never arrives.3PubMed Central. Effects of estrogen on growth plate senescence and epiphyseal fusion
Growth hormone and its downstream partner IGF-1 also matter. Both spike during puberty to fuel the growth spurt, then gradually taper off as puberty ends and the plates close.4The Journal of Clinical Endocrinology & Metabolism. Why Do Normal Children Have Acromegalic Levels of IGF-I During Puberty? Over a full lifespan, growth hormone and IGF-1 decline steadily after the adolescent peak.5PubMed Central. Growth hormone, insulin-like growth factor-1 and the aging brain But it is estrogen that flips the switch on whether the plates stay open or shut.
Why Boys and Girls Follow Different Timelines
Girls typically enter puberty one to two years before boys, which means their estrogen levels rise sooner and their growth plates close sooner. By 17, most girls have reached or are very close to their adult height. Boys, who start the pubertal clock later, are more likely to still have open growth plates at 17 and may continue growing into their late teens or even early twenties.
An MRI study of adolescents and young adults put numbers on this gap. Researchers looked at the growth plate of the distal radius, a commonly assessed site near the wrist, and found that about three-quarters of 17-year-old females had complete fusion there, compared with roughly nine in ten 19-year-old males.6PubMed Central. A cross-sectional magnetic resonance imaging study of factors influencing growth plate closure in adolescents and young adults In practical terms, a 17-year-old girl is more likely to be done growing than a 17-year-old boy, but neither answer is guaranteed. A quarter of those 17-year-old girls in the study still had plates that were not fully fused.
This is a population-level pattern, not an individual prediction. A boy who entered puberty early may be done by 16. A girl who started puberty late may still have a centimeter or two to go at 17. The calendar matters less than where you are in the puberty process.
Late Bloomers and Constitutional Delay
Some teenagers, especially boys, are simply late to start puberty. This pattern, called constitutional delay of growth and puberty, runs in families and is the most common cause of short stature in adolescent boys. The good news is that late bloomers do keep growing after their peers have stopped. The less encouraging news is that catching up is not always complete.
A study tracking boys with constitutional delay found that their near-final heights averaged about 166 cm, which fell short of both their predicted adult height and their mid-parental target height by roughly 5 to 6 cm.7PubMed Central. Evaluation of near final height in boys with constitutional delay in growth and puberty So while late puberty does extend the window for growth, the extra time does not always fully compensate for the slower pace. If you are 17 with delayed puberty, you almost certainly have growth left, but expecting to reach the tall end of your genetic range may be optimistic.
Constitutional delay is generally considered a normal variant rather than a medical problem. But distinguishing it from true growth hormone deficiency or other endocrine issues is important, and a pediatric endocrinologist can help sort that out.
What Nutrition, Sleep, and Illness Can Do
Genetics sets the ceiling for your height, but environment determines how close you get to it. The two biggest environmental players during adolescence are nutrition and chronic illness, and their effects are not always reversible.
Restrictive eating disorders offer a stark example. When malnutrition hits during the pre-pubertal or early pubertal years, the impact on linear growth can be severe. Research on adolescent females with anorexia nervosa found that those who were more severely malnourished at admission had less catch-up growth after recovery, and some never reached their genetic height potential.8PLOS ONE. Linear Growth and Final Height Characteristics in Adolescent Females with Anorexia Nervosa A broader review of restrictive eating disorders echoed this: while many consequences of malnutrition are reversible, the loss of height potential can be permanent without early and aggressive nutritional restoration.9PubMed Central. Linear growth in young people with restrictive eating disorders: “Inching” toward consensus
Vitamin D deficiency is another factor that quietly chips away at growth. A Japanese study of young children found that severe vitamin D deficiency, with blood levels below 10 ng/mL, was associated with about 0.6 cm less height growth per year compared with children who had sufficient levels.10PubMed Central. Impaired Height Growth Associated with Vitamin D Deficiency in Young Children from the Japan Environment and Children’s Study That study focused on younger children, so the direct application to 17-year-olds is uncertain, but chronic deficiency throughout childhood and adolescence can add up.
Sleep comes up constantly in conversations about growing taller, and the relationship is real but often overstated online. Growth hormone is released in pulses during deep sleep, and nighttime sleep duration has shown more consistent links to growth than total hours slept across the day.11Asian Journal of Medicine and Health. Sleep Duration, Quality, and Timing as Modifiable Determinants of Growth and Endocrine Health in Children and Adolescents: A Critical Narrative Review That said, the translation from “more deep sleep equals more growth hormone” to “sleeping more will make you taller” is not as clean as many websites suggest. Getting adequate sleep supports growth, but obsessing over exact hours is unlikely to add meaningful height if your nutrition and overall health are already fine.
How Doctors Measure How Much Growth Is Left
If you are 17 and genuinely want to know whether you have growth remaining, the most reliable tool is a bone age X-ray. A doctor takes a single X-ray of your left hand and wrist, then compares the appearance of your bones and growth plates to a standardized atlas. If your bone age is younger than your calendar age, your plates are still relatively immature and you likely have growth left. If your bone age matches or exceeds your age, you are near the finish line.
This method has been used for decades and is getting more precise with artificial intelligence. A recent deep learning system designed to assess bone age from hand X-rays achieved an average error of just a quarter of a year for bone age and about 1.75 cm for adult height prediction.12PubMed Central. Automated Bone Age Assessment and Adult Height Prediction from Pediatric Hand Radiographs via a Cascaded Deep Learning Framework That is impressively tight, though it is worth keeping in mind that predictions work best for average populations and can be less accurate for individuals at the statistical extremes, including very tall, very short, or very late-maturing teenagers.
Bone age is the single best objective answer to “can I still grow?” If the plates are open, the answer is yes. If they are fused, no intervention will change that.
Your Skeleton Does Not All Stop at Once
Even after the growth plates in your legs and spine close, some bones are still growing. The most dramatic example is the clavicle, the collarbone, whose inner growth plate is one of the last in the body to fuse. Research tracking individuals over time found that male clavicles were still growing at about 3.2 mm per year between ages 16 and 19, and about 1.7 mm per year between ages 20 and 25. Females showed a similar pattern but tapered off more quickly, with growth slowing to about 0.2 mm per year in the 20-to-25 range.13PubMed Central. The Clavicle Continues to Grow During Adolescence and Early Adulthood
The medial clavicular growth plate does not fully fuse until roughly age 23 to 25, making it a useful landmark in forensic age estimation. But clavicle growth does not add to your standing height. It widens your shoulders. So if you are 17 and wondering whether your frame will fill out even after you stop getting taller, the answer is probably yes, especially if you are male. Vertebral bodies can also undergo subtle changes into the early twenties, which may add a very small amount of height in some people, but we are talking fractions of a centimeter.
Does Weightlifting Stunt Your Growth?
This is one of the most persistent myths in youth fitness, and the evidence does not support it. The concern was always that heavy loads could damage open growth plates, leading to premature closure or uneven growth. But reviews of the available research on weightlifting in children and adolescents have not identified growth plate injuries as a meaningful risk when training is properly supervised.14PubMed Central. Weightlifting for Children and Adolescents: A Narrative Review The injuries that do occur tend to be the same muscle strains and overuse problems seen in any sport.
If anything, resistance training during adolescence supports bone density and overall musculoskeletal health. The key is reasonable programming and supervision, not avoidance. Telling a 17-year-old to skip the weight room “because it might stunt your growth” is outdated advice not backed by current evidence.
Growth Hormone Treatment After Childhood
Growth hormone replacement is a well-established treatment for children who are genuinely deficient. But what happens when those children grow up? Some people with growth hormone deficiency diagnosed in childhood are retested during the transition to adult care, and those who still test positive for the deficiency are typically advised to continue replacement therapy. The rationale goes beyond height: maintaining growth hormone levels helps with bone density, body composition, metabolic health, and quality of life.15PubMed Central. Growth hormone deficiency and the transition from pediatric to adult care
For a 17-year-old without a diagnosed deficiency, however, growth hormone injections are not a shortcut to extra inches. The hormone works by stimulating the growth plates, so once those plates have fused, exogenous growth hormone will not add height. It can change body composition, but height gains require open plates. Online sellers of growth-hormone-releasing peptides and secretagogues market heavily to this age group, but the claims far outstrip the evidence, and the regulatory oversight is minimal.
The Bigger Trend in Puberty Timing
One reason the question “can I still grow at 17?” resonates differently today than it would have a century ago is that puberty now arrives earlier. Over the past 150 years, the average age of menarche in industrialized countries has fallen by about three months per decade, from around 17 in the mid-1800s to roughly 13 by the late 1900s.16PubMed Central. Adults at 12? Trends in puberty and their public health consequences Boys have followed a parallel, less well-documented trend. Earlier puberty means earlier growth spurts, but it also means earlier plate closure. A 17-year-old today is, on average, further along in the growth process than a 17-year-old from previous generations would have been.
The causes of this shift include improved nutrition, higher childhood body fat (which accelerates estrogen production), and possibly environmental endocrine disruptors, though the relative contributions are still debated. For a teenager wondering about their own growth, the practical takeaway is that earlier-maturing individuals will be closer to their final height at 17 than later-maturing ones.
Cosmetic Limb Lengthening
For people whose growth plates have closed and who remain deeply dissatisfied with their height, surgical limb lengthening exists. The procedure involves cutting the bone (usually in the legs), then gradually pulling the two segments apart with either an external frame or an internal nail, allowing new bone to fill the gap. It can add roughly 5 to 8 cm of height, but the trade-offs are significant.
A meta-analysis of cosmetic limb lengthening covering nearly 500 patients found that while patient satisfaction was generally high, complications were common. External fixators were associated with “problems” in over half of cases and “obstacles” in nearly half, while internal nails had lower but still substantial rates of problems and obstacles.17Journal of Orthopaedics. Meta-analysis of complications and functional outcomes in cosmetic limb lengthening The recovery period is months long, the cost runs into tens of thousands of dollars, and the risk of infection, nerve damage, and joint stiffness is real. This is not a decision to take lightly, and most surgeons restrict it to adults who have completed growth.
For a 17-year-old, the conversation about limb lengthening is premature in more ways than one. You may not have finished growing, and your feelings about your height at 17 may look very different at 22. Addressing height dissatisfaction psychologically first is almost always the better path.
Height Dissatisfaction in Adolescence
Being unhappy with your height during the teenage years is extremely common, especially among boys who are shorter than their peers or girls who feel they are too tall. A study of over 500 Chinese high school students found that adolescents with high levels of height dissatisfaction reported greater loneliness. Interestingly, actual height did not predict social anxiety or social support, but height dissatisfaction itself, how unhappy someone felt about their height, did predict loneliness.18PubMed Central. Height dissatisfaction and loneliness among adolescents: the chain mediating role of social anxiety and social support
That distinction matters. The problem is often less about the actual centimeters and more about the perception. Teenagers who are still growing frequently compare themselves to peers who matured earlier, which creates a distorted sense of where they will end up. If you are 17 and frustrated with your height, it is worth considering whether the issue is truly physical or whether it is a perception problem amplified by being surrounded by people at wildly different stages of development. Late bloomers who are still mid-growth-spurt at 17 can feel abnormally short in a room full of early maturers who hit their adult height at 14 or 15.