20 here... But on a sidenote, I think recent reports put the average age of a gamer at 28 or 25 years old. As such, I'm not really surprised, a lot more adults play computer games than young kids do.
On the same level, it's kinda absurd to complain about the violence in certain games (as certain American groups like to do) if the average gamers are more than old enough to decide which games they want to play...