games: Rainbow6, Crimson Skies, Unreal Tournament, Mechassault.
I'm also 31, but fortunately I don't have kids (yet), so I do have some time to myself aside from the gf, who loves Halo (thank you God). I totally love R6 and CS, and heartily recommend them to anyone! Co-op R6 is a total blast as well. Thankfully there are starting to be a lot more adult (read mature) players out there, unlike counterstrike.
Edit: I picked up PGR2 this Xmas, I would strongly advise anyone out there that even remotely likes racing games to pick it up. I used to have the first Project Gotham, and got really frustrated with it. But this new version is completely different. Can't wait for Rallisport!
Would have posted this earlier, but PGR2... c'mon!