For me, my attachment to the music of my youth is in large part due to the amount of emotion I have invested it with. This overlaps with, but is not exactly the same as nostalgia. Nostalgia allows me to enjoy certain songs that I rejected when they were released (e.g., certain Foreigner, Styx, Toto and the like). I hear them and it does take me back and somehow I can appreciate the music in a way I couldn’t then. But if I listen to something like Days of Future Past, Headhunters, 2112, Ingenue or Peaches en Regalia, I connect not only with the music, but with my countless past selves that listened to the piece and what they felt when they heard it. Over time, I’ve built a patina of emotional intensity for those pieces. (So if one of you is the guy at 2024 CAF sitting in a small listening room on Saturday facing the long wall who requested Starship Trooper by Yes, that’s why I had tears listening; plus, the system sounded really good.)
This doesn’t preclude me finding new music that I love, but it takes me a while to build the same depth of attachment.