At what age does penis stop growing?

Explanation

It varies a bit from person to person when a man's penis stops growing. In principle, it keeps growing as long as you are in puberty. This means that it can grow until you are some 18-21 years old. Some people enter puberty later, and others earlier. The development is individual and the size of a given penis is not all that important, because a woman's vagina is flexible and will form itself accordingly.