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On average, girls reach their final adult height and stop growing by age 14 or 15, though this figure skews either younger or older depending on when puberty begins. Most girls experience a growth...
If you have a chronic disease, for example, this will affect your height. Most young women achieve their full height within 12 to 18 months after their first period. (around 16 years old) Most young men tend to stop growing at the end of puberty when they begin to shave regularly.(around 18 years old) but mainly girls stop growing around 17-18 and guys 20-21.Source(s): health class.amin Â· 8 years ago.ome people say 17 then they say 19, 20 ,21 etc.... what the real age girls stop growing. Update: I'm a guy people not a girl. The reason i'm typing this is cuz my friend is kinda short and she kinda wants to grow a little more.