at what age I read various books. I can “date” some of the ones I read while I was elementary-school age, because I remember reading them at school or talking to my classmates about them so I know what grade I was in at the time.
But I have zero idea when I first read A Wrinkle in Time, except that I was fairly young. Same for the first time I read The Hobbit. Except that it was early enough that I’d mostly forgotten it by the time the LOTR movies came out. Or A Wizard of Earthsea, come to think of it.