It sort of irks me that people assume that 1) all young people play prodigious amounts of games to the point where an X-Box is some sort of alluring factor, and 2) only young people play games and that gaming is a way to differentiate between ages. I am young, and I would be put off by this sort of thing. If the most appealing part of your company is that you have an X-Box, you're doing it wrong.
It's not so much "XBox" as a specific device, but of the lifestyle and time that younger people are more likely to pour into their early jobs. They're simply more receptive to a job-includes-hobbies lifestyle. This doesn't prevent older people from participating in this world, but statistics would tell us that more older people have children and non-job hobbies. Frankly, as an older person who owns a PS3 and Wii, it tells me that not only do they want hanger-outers for employees, but ones that play specific kinds of games.