Good music is timeless. Since the music scene has not changed much in the last 25 year's, many Millennials and Z's have started to listen to the Great music of the late 70's, the 80's, and the last decade that ROCK the 90's!
We always did.
People who like this music attended 80s parties at RU. And probably listened to Sublime, Pearl Jam, etc which greatly influenced the rock music of the early 00s.