My 16-Year-Old Son Is Still Growing. How Much Growth Could He Have Left?
Most 16-year-old boys still have 1 to 3 inches of growth ahead. Late developers can have more. Bone age is how you get a real number.
The realistic ranges
By 16, most boys are on the back half of their growth curve. How much remains depends heavily on where he is in puberty.
- Early developer (puberty started around age 10-11, spurt peaked at 13-14): often just 0-2 inches remaining. Growth mostly done.
- Typical developer (puberty started 11-13, spurt peaked at 14-15): 1-3 inches remaining, spread over 12-24 months.
- Late developer (puberty started 13-14, spurt peaked at 15-16 or later): 2-5 inches remaining, spread over 2-3 years.
- Very late developer / constitutional delay (puberty still building at 16): can have 4-6+ inches ahead. This is uncommon but real.
The signals of "still growing meaningfully"
- Voice has changed within the last 12-18 months (rather than years ago).
- He still needs new pants or shoes every 6 months.
- Growth velocity is above 1 inch per year.
- His current height is well below his mid-parental height target.
- Bone age is delayed vs. chronological age (requires a wrist x-ray).
Signals of "close to done"
- Voice changed 2+ years ago.
- He has been the same height for 6+ months.
- His growth velocity in the last 12 months is under 0.5 inches.
- Bone age matches chronological age.
How to get a real number
Bone age imaging is the single most useful test. A single wrist x-ray shows how mature his skeleton is. Standardized tables (Greulich-Pyle) convert that to a bone age, and pediatric endocrinologists use bone age to estimate remaining growth. If bone age is 15, he probably has 2+ inches ahead. If bone age is 17, he is mostly done.
Ask his pediatrician about a bone age x-ray at his next visit. It is low-radiation, one image, and gives the clearest answer you can get without waiting for time to pass.
What NOT to spend money on
- Over-the-counter "growth boosters." Nothing sold without a prescription has been shown to change adult height.
- Growth hormone therapy for a healthy late-developer. GH is FDA-approved for specific diagnoses; being a late bloomer is not one of them.
- Supplements marketed for teen height. Save the money.
What actually helps
- Adequate sleep (8-10 hours). Growth hormone releases during deep sleep.
- Adequate nutrition, especially protein and calories.
- Treating chronic conditions that affect growth (thyroid, celiac).
- Not smoking. Smoking during the growth years is associated with reduced adult height.
Height data uses the CDC 2000 Growth Charts for boys. This page is parent education, not medical advice or diagnosis. If you have concerns about your son's growth, talk to his pediatrician, ideally with 6-12 months of measurements in hand. © 2026 The Growth Path.