Video games do have age restrictions. Unfortunately the world is full of shitty parents that ignore them. I've been playing video games since Pong. I was around 7. I've played all of the games cited as harmful at the ages specifically stated as being the most vulnerable (Doom, Duke Nukem, etc). I even played Dungeons and Dragons when in middle school. According to popular social beliefs I should be an antisocial, homicidal, psychotic shut in. I am not. Why? Because I had good parents. They monitored what I did and gave me perspective and guidance. I learned the difference between entertaining fantasy and appropriate reality. I never thought it was a good idea to aim a gun at my face because I saw them do it in a cartoon. If a kid is that heavily effected they either had lazy parents or (more likely) emotional / mental issues that made them susceptible to begin with.