I started playing GTA games from Year 7 tbh as I got San Andreas for 2004 Xmas as I begged for it. My mum would watch me playing games up until I was about 15 or so, but she always trusted in her raising of me that playing violent games or watching gory movies wouldn't cloud my mind and it didn't.
Won't even lie, the only time it ever got awk was if a game got a little sexual.