5'11" - 160lbs - 35yr old here. I pretty much eat whatever the hell I want because I work a very physical job (Roofing) every day.  I have had trouble gaining weight most my life and always got told 'oh your metabolism will slow down by 30 and you'll get fat' well I'm 35 now and its still going strong. I actually got one of my fat friends a job this year with us and he is down to human weight now.