I think kids aren't the best comparison with senior citizens when it comes to technology. I've got senior citizen parents and I've got nieces and nephews who are all under 10 years old. The kids are so much more adept at pretty much any technology they get their hands on when compared to my parents (iphones, nintendo switch, tv remotes, etc). They start off about as poorly as my parents do but quickly overcome them. My parents aren't tech illiterate, either -- my dad especially was quite a DOS power user back in the day, and to some degree has kept it up with his Windows usage too.

I think part of it might be due to the neural pathways still forming in the kids brains, but I also think a lot of it has to do with who they're around. The kids are around their parents who are using this tech all the time, while my parents don't have that benefit except for in comparatively small doses.