I once played Gears of War with a 72 years old grandpa, on xBox LIVE.
Nice person, but:
1)God, he was awful. I mean REALLY awful. I mean walking-against-the-wall-for-10-seconds awful.
2)He wouldn't shut up. I'm not trying to evoke the typical stereotype or anything, I'm serious, half the time you had to mute him because he just wouldn't shut the hell up! Yes, you're 72, yes, getting used to the controls is likely very challenging, we understand that, but we really don't need to hear your story about how you tried to use a mouse and failed at it over the course of who knows how many games you mentioned, over and over and over again!
[/rant]