I’m old, too, and going back and filling in gaps in my music knowledge base, and listening to a lot of stuff I’ve been meaning to for decades.
However, I have also realized that my favorites have solidified, after decades of listening and deciding. Pink Floyd, Beatles, Rolling Stones, Who, Yes, Led Zep, and a few others have fought their way to the front of the pack.
I found Animals to be the most difficult to get into, but once it clicked, it became one of my favorites. It’s a great album, but The Wall still beats it, in my opinion.