i'm 15 and 5'9/180 lbs, i don't own a bench so i rarely get to work with them, but when i was 14 i was big on benching, i put maxed 200 lbs and tried to do it twice, and injured my shoulder, so that was a pain in the ass, now i just do push ups, i went on a bench the other day and i was repping 175 about 8 times, i know a kid who's 17 and is about 5'4 or so weighs 150 lbs and can max 350, i thought it was crazy.