Boys typically stop growing around the age of 16 to 18, with most reaching their full maturity, including growth and body changes, by age 18

. However, some may continue to grow into their early twenties, albeit in rare cases. Genetics play a significant role in determining an individual's final height, and external factors such as diet and sleep also influence growth

. Puberty can last anywhere from 2 to 5 years, and the fastest rate of growth usually occurs 1 to 2 years after puberty has started

. The growth plates of long bones fuse shortly after puberty, which is the main reason why most boys stop growing at this age