no idea on average age or maturity... but this is what i will add. I myself am 25, wife is 23 and we both play. My mother in law plays and she is about to turn 50 and my brothers in law are 17 and 27 and they both play. i couldnt really imagine my 8 to 12 year old nephews and nieces playing... keep thinking that they are too young... but some of you say there are 8 year olds playing...that to me is amazing. My maturity fluctuates depending on which toon im playing... if its my 49 twink... i get retarded while waiting on queue on the trade channel for the hell of it...on my lowbie druid... im the coolest guy around.