Not entirely...john102 said:11-15 although there is a great amount of maturity difference between an eleven and fifteen year old.
Your age DOESN'T really factor in with your maturity. However, you're age DOES pre-dictate what would certain expectations would be. For example, if you're 13, then it's expected that you have generally don't have much knowledge into Forums or community with other members of a forum with proper forum etiquette. At the same time, this type of generalization can affect anyone of older age if it seems like so.
Take me for example.
I'm a pretty young teen who knows his way around vocabulary and general English skills. At first, if I hadn't told you my age, certain people would assume I was some old man who has blunt and very boring. I'm pretty sure that people like to judge others by their age, but you need to reserve some space to look into their background if they truely are what you think they are.