I don't think it matters on what age you are...if you're mature enough to play the game, enjoy it (maybe be addicted to it? lol), and not do anything in real life that's related to the game...then you are mature enough to play almost any game and not really be affected to what goes on in the game.
Off topic: Unlike many other dumb@**es. They get too addicted and obsessed with the game and they end up doing something jacked up and they end up murdering someone because they think they are Dante/Vergil! Just like the San Andreas incident. A kid was obsessed with that game and then he killed a few police officers and stealing a car. And a kid even killed his whole family and burning his house because he thought he was Dante! Or however the story went....Another game incident is that this one kid was playing that one game "Manhunt", it is banned from many countries because this kid played it and ended up luring his own friend into the woods and then killed him with a freaking hammer! Pretty soon somone will attach two knives on a chain and end up going on a rampage saying "I'm Kratos"! Then they will end up wrecking the whole God of War series because they thought they could really become the God of War if they killed many people! It is just a matter of time before someone does that....
Sorry for the off-topic thing. I get really steemed up when it comes to obsession becoming reality.