You're looking at it from the wrong direction. It's what age is the cut off that gaming was the norm growing up, and therefore remains a part of the culture at any age. I'm 38 and most people I know, both men and women, are into some type of gaming. I feel I'm already fairly close to that line so if you're looking at just a decade ahead, you grew up in the 70s and early 80s when gaming was just truly making it's first rise. For my generation in the 1990s though it was almost an expectation of childhood and making friends. Looks like you have to start dating people in their 30s.