What is th normal 13 year old males penis length
4 inches- 7 inches, bigger or smaller its natural no two penises are the same. Every grows at their own rate.
It can vary greatly for a 13 y.o. might be as little as 2"-3". Could be 6" or more. Depends on if he's in puberty and when puberty started and how fast his body is developing.
many can be big because they want something from a girl