You would be shocked to know how often my daughter and I talk about this exact thing. My wife and I are "born slightly too late" hippies who are obsessed with the music of our generation. I'm sure that influenced our daughter. She grew up in the Spotify world. I am astounded by and jealous of the breadth and diversity of her tastes. Her theory, which I can't verify, is that Pink Floyd, in particular, is the only band of that time, which of course includes the Beatles, that transcends generations. She thinks it's a combination of the lyrics, which have that Catcher In The Rye kind of feeling estranged from normies sensibility, and the music, which simply doesn't sound dated. All I can base it on is that I go to a lot of concerts by old guys who's music I love, and Roger Waters always seems to draw the widest age demographic. You're probably right that it might be a small sample size, and my daughter's friends tend to have older parents like us.