My ~50 year old guitar teacher told me a story about how he refused to even try guitar hero. I agree that, as an accomplished musicians, it would be kind of insulting to be asked to play guitar hero by your student. But it's such a good opportunity to learn where the student is coming from, and understand how it could teach timing and patterns, even if it doesn't teach fingering or picking.
My ~65 year old dad is still working as a consultant and actively gives paid speeches, and he plays a lot of solitaire and minesweeper on the computer. I've tried to get him to try a few videos game-- I even pitched Kerbal Space Program, from the educational aspect of understand our own space program better. (When I was in D.C. at the National Air and Space Museum, I was recognizing parts that KSP had copied the models of.) He has no interest in it.
My mom, and my aunts on both side of the family are extremely stubborn about their political beliefs, and phrase their responses as: "oh, well, I believe that ____". Not trying to seek a consensus, not trying to crack an argument. Just laying out their own belief. (Their political beliefs range from: common Democrat, pro-choice conservative, global-focused liberal.)
I get the idea that, as we grow older, we've kind of discovered what we like and what we don't like. I usually just have Cookies & Cream ice cream, because it's my favorite. I don't try rocky road again because the nuts give it a bad texture. But if a young person strongly recommended Rocky Road Version 5, I hope I would try it for the sake of trying it.
So that's where my ageism comes from. I've told my younger brother to call me out on not being open to new experiences, if that's something that happens to me in my old age. At the very least, it'll be a good source of brotherly humor.