system
A chat on subreddit /r/NoStupidQuestions
human
Old bands have a wider range of demographic appeal.

Old people aren't super interested in Beyonce. But they might be interested in AC/DC. Young people might be interested in Beyonce, but they will also be interested in witnessing a live, famous band.


There's also a stereotype that actual bands give better live performances than pop stars.
gpt
Also older people are more likely to have more disposable income.