19MWHB96210316 over a year ago whats the avarage size of a hard penis for a 15 year old white male........ Loading... bobdylan45190240 over a year ago Hi at your age you gotta be looking at (5inches) at least enjoy your teens.....Bob Reply Loading... medic-dan109453 over a year ago 5-5 1/2" is average for an adult male. Reply Loading...