Pretty sure this isn't true for most people. I don't listen to anything that I did as a teenager anymore. Sure, if I do hear some song from back then it's nostalgic and I do put on a song now and then, mostly at parties when the topic comes up or you know others there would like it but it's very much not part of my daily listening. And I feel the same kind of nostalgia for things I listened to in my 20s that aren't part of my current tastes. But I never put on whole albums or playlists of just bands and songs from then. I'm certain that most of the music I listen to now would have been liked by my teenage self though, just hadn't explored and expanded my taste and knowledge as much.

And I feel people who only listen to stuff from their teens are kinda sad and I feel bad for them, they certainly have some trauma or other issues that make them stick to that and never want to explore both new music and themselves in what they might discover they like.