Where there’s a wallet, there’s a way.
My eighty-year-old dad keeps sharp by not staring at the tv, reading challenging literature along with entertaining literature, and by playing Sudoku. No cobwebs in his mind. (However, to be fair, I cannot recall any elderly relative of mine who had or has dementia and they almost all lived into their nineties or at least late eighties so perhaps it doesn’t run in the family.) Mom’s in good shape too, as well as all seven of my parent’s siblings.
Makes sense to me.
I once worked with some computer programmers. I was a graphic artist.
I went to lunch with them a few times. Despite the gulf, I vaguely understood the nature of their banter: abstract, sarcastic, insular, competitive, and judgmental. There was one, a generous soul, who put great effort in responding to the neophyte’s dumb questions. At one point he silenced the others until he could finish.
It was a mental work-out.
That’s what smart people do.
Wonder if they have a "No Grunting" policy.