Girls typically grow quickly through childhood, then experience a final growth spurt around puberty before height growth stops. Here’s what actually happens and when, along with the real warning signs worth discussing with a doctor.
At What Age Do Girls Stop Growing?
Most girls reach close to their adult height by around age 14 to 15, typically within 1 to 2 years after their first period (menarche). Growth plates in the long bones gradually close as puberty completes, usually finishing by around age 16, though small additional height gains occasionally continue for a while after that. Timing varies meaningfully between individuals — genetics is the biggest factor.
The Puberty Timeline
Puberty in girls typically begins between ages 8 and 13, starting with breast development, followed by the growth spurt, and then the first period roughly 2 to 2.5 years after puberty begins on average. After the first period, height growth continues but slows considerably, usually adding only a few more inches before it stops.
Genetics play the largest role in determining both the timing and the eventual adult height. Nutrition, overall health, and sleep also support healthy growth, though they don’t override genetic potential.
Girls vs Boys: Timing Differences
Girls generally begin and complete puberty about 1 to 2 years earlier than boys. Boys typically start puberty between ages 9 and 14 and tend to keep growing in height into their late teens, often until around 18, whereas girls’ height growth generally finishes earlier, in the mid-teens.
When to Talk to a Doctor
A pediatrician can evaluate growth and puberty timing if:
- There are no signs of breast development by age 13
- Menstruation hasn’t started by age 15-16
- Growth appears to have stopped unusually early, or height falls well outside the expected range for the family
- Puberty is starting notably earlier than age 8 (precocious puberty), which also warrants evaluation
Recognized causes of delayed growth or puberty include hormonal conditions (such as growth hormone deficiency or thyroid disorders), chronic illnesses that affect nutrition or overall health, some genetic conditions (such as Turner syndrome), and inadequate nutrition. A doctor may use bone-age X-rays, blood tests, or hormone panels to identify the cause and determine whether treatment is appropriate.
Typical Height by Age
These are general averages — individual height varies widely and is influenced heavily by genetics:
| Age | Height (inches) | Height (cm) |
|---|---|---|
| 8 | ~50 | ~127 |
| 10 | ~54 | ~138 |
| 12 | ~59 | ~151 |
| 14 | ~63 | ~160 |
| 16 | ~64 | ~163 |
| 18 | ~64 | ~163 |
The Bottom Line
Most girls reach close to their adult height in their mid-teens, generally within a couple of years of their first period. Genetics is the strongest predictor, but good nutrition, sleep, and overall health support healthy growth along the way. If growth or puberty timing seems notably off from what’s typical, a pediatrician can check for an underlying cause.
Frequently Asked Questions
At what age do girls typically stop growing in height?
Most girls reach close to their adult height by around 14 to 15, generally within 1 to 2 years after their first period. Growth plates typically finish closing by around 16, though individual timing varies.
What factors influence when a girl stops growing?
Genetics is the biggest factor, along with nutrition, overall health, and hormonal timing. A significant chronic illness or hormonal condition can also affect growth timing.
Can a girl’s adult height be predicted from her parents’ height?
Parental height is a meaningful predictor since genetics plays the largest role, but it isn’t precise – other factors mean actual adult height can vary from the genetic estimate.
Do girls keep growing after their first period?
Yes, but growth slows significantly and is usually limited to a few more inches over the following 1 to 2 years before height growth stops.
This article is for general information and is not a substitute for medical advice. Contact a pediatrician with any concerns about a child’s growth or development.
