The stuff I read as a teen is hard to go back too, except the sci fi, that seems to age well for me.
What I'm really enjoying right now is reading books with my daughter that I loved as a kid - we're working through Madeleine L'Engle right now, and I still love those stories. C.S. Lewis - huh, there's a lot in there I don't remember
. So some work, some not so much. However, that might be true of books I read last year too!