Honestly, I think I might go with my iPod Touch and show "me" something on it like Solomon's Keep or even Street Fighter 4. Because "I" would be blown away by that (I'm 36), but not overwhelmed by it, either.
If I thought "I" could handle it, I would go with something like inFamous, because I have always loved superpower stuff, and that game looked great and was extremely fun to play. But I remember how I felt playing the demo - you had a bunch of powers, and it was overwhelming. Then I think back to the Atari and NES days, and the difference between those controllers and a PS3 controller, and I think that if I showed inFamous to me as a kid, it'd be too much to take.
Aw, who knows - maybe I'm not giving "me" enough credit. :)