At what age did you play your first M rated game?

[RCTjunkie]

I was 5 when I played an M-rated Dinosaur game. I didn't get very far in the game, so no worries of getting scarred.

I was 13 when I played Halo at a friend's house, and after that I never really played an M-game consistently, save for TellTale's Walking Dead game.