"Am I done growing?" is one of the most-searched questions by teens — and for good reason. If your growth plates are still open, the habits you build right now directly affect your final height. If they've fused, no product or routine will add bone length.
Here are the signs that suggest your plates are still open, and the one way to know for sure.
The 7 Signs
1. You've Grown in the Last 6–12 Months
The clearest sign. If your height has increased since your last measurement — even 1–2 cm — your plates are still open and working. Measure correctly (same time of day, no shoes, against a wall) using our measuring guide.
2. Your Shoe Size Recently Changed
Feet often grow before the big height spurt. A recent shoe size jump — especially early in puberty — usually means more height is coming.
3. You're Still in Puberty
Growth plates fuse near the end of puberty. If your voice is still changing, you're still developing, or puberty started late for you, your plates are very likely still open.
4. You're Younger Than the Typical Closure Age
- Girls: plates typically fuse around 13–15
- Boys: typically 15–17, sometimes later
If you're below these ranges, odds are strongly in your favor. Full breakdown in When Do Growth Plates Close?
5. Your Parents Were Late Bloomers
Growth timing runs in families. If your mom or dad kept growing at 17–18, there's a good chance you will too. Some of the most famous athletes were late bloomers — read Dennis Rodman's story, who grew 8 inches after high school.
6. Growing Pains or Recent Clumsiness
Aching legs at night and a suddenly clumsy phase often accompany active growth spurts — your brain is recalibrating to a changing body.
7. You Started Puberty Later Than Friends
Late starters finish later. If your growth spurt began at 14–15 while friends started at 11–12, your growth window likely extends further than theirs.
The Only Way to Know FOR SURE: a Bone Age X-Ray
Every sign above is probability, not proof. The only definitive answer is a left-hand X-ray read for "bone age" — a doctor compares your growth plates against reference standards. It takes minutes and is a routine request at a pediatrician or endocrinologist.
Worth asking for if:
- You haven't grown at all in over a year
- You're far behind (or ahead of) the typical timeline
- Your predicted height matters for a sport or career decision
Still Open? Don't Waste It
If your plates are still open, you're in the window where habits matter most:
- Sleep 8–10 hours — growth hormone peaks in deep sleep (why sleep matters)
- Eat for growth — protein, calcium, vitamin D (best foods to grow taller)
- Move daily — these exercises support your growth window
- Know your number — the TallerTeen app gives you a research-based height estimate and tracks the habits that protect it
And if they're closed? You can still gain visible height through posture correction — most slouching teens are hiding 2–5 cm.
The Bottom Line
Recent growth, ongoing puberty, late-blooming genetics, and your age all hint at open growth plates — but a bone-age X-ray is the only certainty. Either way, the smartest move is the same: build the habits now, while the window is (probably) still open.
Sources: NIH Puberty & Growth Research, CDC Growth Charts, AAP Stages of Puberty, AAOS OrthoInfo Growth Plate Guide.