I don't think my tastes have changed all that much. They have always been fairly broad with a prediliction for more leftfield artists and the downright weird. But I pretty much still like (and dislike) now what I can remember I listened to as a pre-teen. One of my earliest musical memories (age 7) is obsessing over an NME flexidisc giveaway of Alice Cooper's Slick Black Limousine. Due to having an older sibling with, at the time, decent taste I was well into the likes of Hawkwind, Groundhogs and Bowie, peppered with Jake Thackray, Bob & Marcia and The Sensational Alex Harvey Band long before I ever heard ABBA or The Beatles. All artists I stll enjoy to this day.
Like others here I never understood the appeal of stuff like Steely Dan, Rush or Kiss and I still don't. Dreadful, dreadful music.
What has changed is probably my attention span. While I always enjoyed it when Peel played some chirpy guitar workout from The Four Brothers my attention would have wandered after the first few minutes of a Fela Kuti afrobeat jam which often only really gets going after 15-20 minutes. Nowadays, the longer the better. I also gravitate now to more instrumental music or, if there is singing, then preferably in a language I don't understand. That said, I have come to appreciate solo vocal performance in the English folk tradition like Anne Briggs or Shirley Collins (who has recently released her third 'comeback' album at the age of 89 - go Shirley!) or 'singer-songwriter' artists I probably didn't have much time for back in the day.
Due to the ubiquitous availability of streaming it's now easier to 'get' – in both senses of the word - an artist or genre than it was pre-Spotify. There are vast swathes of African music that, even if I was aware of it in, say 1982, was almost impossible to source outside of specialist boutiques at exhorbitant prices. It's now possible to deep-dive into Congolese Soukos, Ghanian Highlife or Zimbabwean Chimurenga with negligible effort. Let alone more exotic fayre from the Arabic world and further east to Persia, India, China and beyond, or back in time to the roots of Delta Blues, French Chanson, Bluegrass or Gypsy Jazz.