No age is too old to play video games. The average gamer age is closer to 30 than 20. Our generation will be playing video games well into our 60s, just like 60 year olds now happily watch TV for entertainment, something considered for children when those people were growing up.
I'm 29, married and have 3 kids. I play video games quite a bit (though it can be a challenge from time to time). My wife, 27, also plays. Same as my father, 62, (though he only plays the Civilization series) and brother, 37.
like throwing frisbees, going for walks, or running around in circles around a tree.
You know, I bet most of us did at least one of these things as a kid. However I do agree with the video games with a lot of grinding like MMORPGs, but it's fine if it's on a handheld because playing a laptop, DS, PSP, 3DS, or Vita is much more productive then say pretending to text other people on your smartphone or playing a sad excuse of a game on the smartphone.