This is a debate I often have with my brother. We were raised primarily by our mother, who would refuse to let us play any M-rated games until we were 17. We both hated it, of course--I wanted to play Grand Theft Auto III, dammit.
Today, my brother thinks she was being unreasonable, and fully intends to allow his kids to play M-rated games from a fairly early age--maybe around 12 or 13. As for myself, I can understand where my mother was coming from by making us wait; I think she was being a responsible parent.
I was just wondering what current and prospective parents, who are gamers themselves, have to say on the topic.