While a little reductive and caricatured, as a Gen-X counterculture type myself I can confirm that there's quite a bit of accuracy in this comment. And a lot more examples in more boring parts of the world than these famous people you are mentioning.

With that said it's not exclusively a Gen-X thing to go from counterculture to establishment while preserving the same root personality driver of narcissism and selfishness. It's obviously recognizable as the trajectory of the Woodstock generation as well.