You should be at least 11,12 or 13.It depends on how "bad" the game is.
11 years:Castlevania to maybe Halo
12 year olds should handle Team Fortress Games.
13:Anything that's not as bad as grand theft auto
~My Opinion
Well....it depends on how you look at the game. I think that people that are 12 or 13 should be mature enough to play games of the such. But of course. There are alot of immature KIDS out in this world, and they can't handle most stuff that happens. Soo...I guess games shouldn't have a rating but then I think they should. If that makes any sense what so ever....
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Depends on the parents opinion. The game is rated M for Mature, so you will not be able to buy it unless you are of age. ( age varies in different states)
That depends if the parents allow the child to play them. So do you allow a 9 year old child play a teen rated game?
On facebook you can play lots of mature game like UNO, poker, and lots of more
Personally my children are drawn to reality and quite mature so its not that big a deal what my sons play or watch, I played lots of over rated games 20 years ago am still alive and sane so I don't think any one should be restricted from what they see or here.
Playstation can be used by all age levels, it just depends what game you are playing. Check the rating before you play it. Games can range from rated E for everyone to M for mature.