The process you are describing happens to everyone, Russ, and has been happening since at least the time of the Han Dynasty of ancient China, if not long before that.

Why would someone go for the popular music of kids who are 30 or 40 years younger? What would be the chances? Things change, but most people remain most attached to the things they experienced in their formative years when they had the greatest hunger for life. That's natural. You can even see it in animals, although they are pretty much free of what we would term culture.

You say it like it's a bad thing...