A person is defined mature through his attitude if he can able to respond in an appropriate manner to his environment. But what if the person was not raised in a mature intellectual way he can still turn into one if he would depend on himself.
Thing is one can never remove people from society. At one point or the other they have to integrate into society in order to survive, unless they are superman or someone like that. In which case they would probably never fit into society.
So if this person is to go to school, even when he/she has not been raised to be mature, society will probably compel the person to be mature. For people who have not been raised to mature, they'll learn pretty quick at school what maturity is about. Some make it, and those who don't probably turn into loners of a kind.
I think someone can get his or her own maturity by instinct. There are a lot of people that can't get mature although raised in mature intelectual environment.
some age others mature...
Agreed with the subject. age is not a sign of maturity.
Looking at all those old politicians acting like kids, the more true this is is