This is just by far a sweet game for ADULTS not kids. The game is about 4 what appear to be mentally illed characters "If you played Twisted Metal Black you would see they all start off in a Insane Asylum". They compete to get a wish the Clown = Kill his own daughter "How stupid", Doll = To be a famous Model, Grimm = To save his faughter. The game even dough i enjoy driving fast cars is very pointless nothing fun really happens its cool but.. it did not take long for me to get over the game and it is by far the most frustrating game i have ever played i broke 2 controllers trying to complete the game with levels that seemed impossible.
The Twisted Metal series is known for being outlandish and over-the-top and this entry is no different. It is a violent car combat game that any gamer would enjoy. That being said, the main story line does include some mature story telling through live action cutscenes. The gameplay itself is appropriate for most teens and I would only advise a parent make sure their child knows how unrealistic and over-the-top Twisted Metal makes car combat and driving in general.
Bottom line: any mature teen (15 or up in my opinion) would be fine playing the game.