I am thirteen and i am jsut hitting puberty and my penis has yet to grow.My flacid or not hard is 4 inches and my hard or errect is 5 and 1/4 inches. I am wondering if i am going to be well hung when i am older because my dad and my older brother are. What is the average size for someone who has not gone through puberty and what is the average size for someone who has. Also is there anyway i can predict how large i am going to be.