Most girls stop growing about two years after their first period, which for many happens around ages 12 to 13. Height usually levels off by 14 to 15, though girls who start puberty later may keep gaining a little height for longer. Early starters tend to finish earlier, while later starters often finish later.
Growth slows as the growth plates in the bones close under the influence of hormones during puberty. Genetics, nutrition, sleep, and overall health also play a role in how tall someone becomes and when growth ends.
If growth seems unusually fast or slow, or if there are signs of very early or delayed puberty, a doctor may order simple tests to check hormones, like an FSH blood test used to evaluate early or delayed puberty. Lack of periods, also known as amenorrhea, by age 16 or no signs of puberty by 13 are reasons to be seen for assessment.
For concerns about growth or puberty timing, the most appropriate specialist is a pediatrician or pediatric endocrinologist. Do not use hormones or supplements without medical guidance.