I have known thousands of musicians over the years. In that entire pool of actively performing musicians, I have only known one who suffered dementia. And I have known many who were extremely vibrant mentally deep into their 80s, or even 90s.

My head is just plain flat worn out from overworking it.

I was joking. I've been playing music almost continuously, playing and singing, since I was a kid, and that was a long time ago.

It was a lame attempt at an old person joke, meaning ~ I'm not forgetting things because of dementia, it must be just because my poor brain is totally worn out from overuse, doing all that work playing and singing for many decades.

Thanks for the good news.