I read some digital market reports a few years back, which showed that something like 98% of all people between 13-18 were gaming. Obviously mostly casual games, but nevertheless paying consumers of games. More female than male by a close margin.

When I discussed it on another gaming forum they were really quick to dismiss casual games altogether, despite it being the very largest group. There's probably still a male majority in desktop first person shooters, which seemed to be the only "correct" gamers according to he kind of people following that kind of forum. Anyway, if I were to program a game I surely wouldn't aim at the "stereotypical" gamer. They're a minority with very high demands and very expensive gear. The whole stereotype is gatekept to the point where I don't want to participate neither as a gamer or as developer.