Hayden Adrian answered 11/25/2009 How Much Should A 14 Year Old Bench Press That Is 5'8 And Weighs 120? You guys are all scrawny I'm 14 almost 15 5 foot 7 and I max out at 175 on bench and 255 on squat. Stop sitting around asking questions you know the answers too. Go out to and gym and gain some muscle.