i unno....but im 17 and my penis while erect is only 6''2 inches :-( , but to be honest i jackoff like almost literally every night so i know my sperm's a good army:) !! but i got some questions A: is this normal for my age? B: will i continue to grow? and C: what helps to speed up the enlargment process?!?!?!?!?!
To answer your size question, you are actually above-average. Depending on where you ask/look, the average is around five inches. If you're finished going through puberty, then you'll stay at that size.