Growth charts show that majority of guys grow just a little after the ages of 18. In rare cases, some people may hit puberty in their late teens and continue to grow into their early twenties.

What age do guys usually stop growing?

Boys tend to show the first physical changes of puberty between the ages of 10 and 16. They tend to grow most quickly between ages 12 and 15. The growth spurt of boys is, on average, about 2 years later than that of girls. By age 16, most boys have stopped growing, but their muscles will continue to develop.

How do you know if a boy has stopped growing?

. This period could last up to two years; after that, the growth rate begins to slow. By the time facial and underarm hair is present, the boy's voice has changed permanently and sexual development has completed, the rapid growth period is usually over.