As I go back to a book that I read that long ago, I am always encouraged at how much of it comes back, as I have the book in my hand and read some of it.
I especially like books that I previously had underlined some of the parts I liked in red. This becomes a good shortcut to re reading; reading the underlined items. Too bad I didn't do that more.
So glad that what was read before is usually still in my memory, and can be found. Re-reading is a good thing.