IIRC, the average age for the gamer is about 35 or so and the average
gamer buyer is abouty 30-40 years. Half of them are women, as well
!
I do think, game companies could earn much more money if they targeted some of their games to the more adult (or mature) gaming audience i.e the 25+ crowd.
Unfortunately, adventure games are seen as either kids games or old folks games. (by the developers e.g.)
I haven't any advice as to how to rectify this situation.