I know my brothers played Doom and unreal tournament but I did not like FPS games so I did not join in.
I think the first Diablo was rated 15+ or something I know I played that game when I was 10 or 11. The first Starcraft is similar.
Played GTA 2 when it released as well and probably played Eternal Darkness before I was old enough.
I remember mom did not like some games we played but it did not bother me since most games I liked was not intended for an older audience anyway. Except for Diablo but she did not know about that =)