Some interesting research on gaming by stats firm Nielsen:
Gamers are getting older, with 25% now over the age of 40. 40% of all US households have some kind of gaming system. Gamers spend an average of 5 hours a week playing alone and 3 hours a week playing online. That trend is modified by age: over the age of 45, 79% of a gamer’s time is spent playing alone, where as gamers in their teens play more socially.