Since there was some discussion on this subject the other day I figured I'd post this.
From: http://gamerscoreblog.com/team/archive/2006/05/02/534591.aspx
Results from 2005 Entertainment Software Association findings.
From: http://gamerscoreblog.com/team/archive/2006/05/02/534591.aspx
The video game industry is growing in popularity among all age groups and both genders. The average age of a gamer is 30, and 19 percent of gamers are older than 50. Men currently dominate the industry; however, the gap is closing, with approximately 55 percent of players being male and approximately 43 percent female.
Results from 2005 Entertainment Software Association findings.