12 & 13 choose own games?

I think twelve and thirteen years old "kids" CAN choose their own games but only games that are rated and appropriate for their age (i.e. early childhood, everyone, teenagers, and everyone 10+) because these games does NOT contains any violents (or some, not much), any form of drugs or alcohol. I think twelve and thirteen years old can choose their games freely but should be under a supervised of an older adults who understand a lot about the good side and the bad side. In conclusion, twelve and thirteen years old should NOT play games that are not suitable for them (i.e.  mature 17+, and adults only 18+), and under any circumstances they should be supervised and advised by an adult that understand a lot about games.