answered 8/9/2010 How Big Should A 14 Year Olds Penis Be? Ive just turned 14 so you can kinda class me as a 13 year old mine is 4.2 non erect 6.0 semi erect and 6.5 erect can you tell me if this is good and class me as a 13 year old as I have only been 14 for a couple of days