when do growth plates close
Growth plates usually close by the mid‑ to late‑teens, once puberty is wrapping up; after that, your bones generally stop getting longer and your height “locks in.”
Quick Scoop
- Girls: Growth plates typically close around age 13–16 , most often within 1–2 years after the first period.
- Boys: Growth plates usually close around age 15–19 , often a bit later if puberty starts late.
What “growth plates closing” means
Growth plates (also called epiphyseal plates) are thin layers of cartilage near the ends of long bones that drive childhood and teenage height growth.
When hormones signal the end of puberty, that cartilage gradually hardens into solid bone, “fusing” the plate and stopping further lengthening of that bone.
Typical closing windows by gender
Group| Typical age when growth plates close| Notes
---|---|---
Girls| About 13–16 years 35| Often 1–2 years after first period; height
growth slows and then stops.
Boys| About 15–19 years 357| Can run a bit later in “late bloomers,” so
some keep growing into late teens.
How to tell if they’re closed
Clinically, doctors use an X‑ray or hand/wrist bone‑age X‑ray to see if the dark lines of the growth plates are still visible or have turned into solid bone.
If the plates are fully fused, the person has likely reached their final adult height for that bone segment.
What affects the timing
Several factors can move that window a bit earlier or later:
- Genetics and family pattern (when parents finished growing).
- Hormone levels , especially estrogen and growth‑hormone–related pathways.
- Nutrition, chronic illness, or endocrine disorders ; in some cases, growth‑hormone treatment or puberty‑delaying meds can prolong the time growth plates stay open.
Why this matters in real life
Knowing roughly when do growth plates close helps:
- Teens and parents gauge how much height potential is left and whether a growth‑spurt lull is temporary.
- Doctors decide if growth‑hormone or other interventions can still boost height before plates shut down.
- Coaches and families manage sports‑injury risk , since open growth plates are more fragile and prone to fractures.
If you’re under 18 and curious whether your plates are still open, a pediatrician or pediatric endocrinologist can check with a growth‑assessment workup and X‑ray.
Information gathered from public forums or data available on the internet and portrayed here.