I think it was discussed before, but maybe not in this topic? It often seems, that people getting older, they spend perhaps less time with music. Work, family, whatever other things they have in life, suddenly find themselves with perhaps former collection of thousands of releases in shelves, but realistically listen only one record a day, or even one in week... or month. Whole notion of "new music" becomes quite obsolete, if you are no longer listening even your absolute favorites.
Some people, like myself, who may be listening probably 30-40 hours a week minimum, have plenty of time to check out new releases. To spend couple thousand hours listening just the undisputed classics would not be very inspiring for me.
Just last weekend at the Harsh Ways Fest, I mentioned that I don't listen to Black Sabbath... nor Metallica, nor Iron Maiden. With exception of 1 CD, all Slayer been weeded out from collection. "What's wrong with you?" was the question what appeared. haha. But it really is that I prefer to hear the bands these bands that were influenced by these, doing it more rugged ways, than sticking on the undisputed classics. With noise, it is not exactly like that. I do listen the classics too, but listening guaranteed genre defining classics is different thing than checking out the less appreciated smaller names and newcomers that inspire in different ways. Especially it makes it clear how this is absolutely not about nostalgic emotions, and re-living the youth.