Honestly Bowie already seemed like an "old person" act when I became a fan in the '80s. When Live Aid happened in 1985, a popular take was that it was a bunch of old has-beens trying to revive their careers. Eg. Bowie, McCartney, Led Zeppelin, Queen, Elton John.
until it's new again, because young people of today are going to become old too and their kids are going to think tik tok hits are old, but will remember when their grandparents took them for a walk in the park listening to David Bowie.
edit: I'm imagining what they would say. I'm not here to offend Bowie fans.