One thing I've noticed about older people, and even myself (nowhere near 80). They have much more uneven cognitive performance. There's just days where their

One thing I've noticed about older people, and even myself (nowhere near 80). They have much more uneven cognitive performance. There's just days where their thinking is crap. I'm 43. I'm nearly as sharp as my peak as I was 20 years ago (and I have a lot more knowledge). But I can only access that "peak" on maybe a third of days now.