Books

I'm also in my 60s, I'm recently retired, and have been reading quite a bit (not as much as you, but I'm on my 70th book since the beginning of the year).

A couple years ago, I started keeping a log of the books I've read. It's just title, author, brief synopsis, whether I liked it or not, and maybe a little commentary. I initially started it just so I could remember what books I read, but then some friends started asking to see it to help them their next book.

It's really helped me remember what I've read. Often I can remember just from hearing the title, but sometimes I have to look back at my notes, and then it usually all comes back to me. You might give it a try and see if it helps you, too.