I've been to many concerts where the performer(s) have been past their best or had other issues. That's my choice and I can take such things into account. If you only go to a show expecting to turn the clock back 40 years, that surely shows a lack of imagination and understanding somewhere.

There is an argument that some artists might be better off retiring but that's up to them but audiences should also be able to tailor their expectations too.

However, the headline here from "Guest" is particularly harsh and insensitive. It says more about the poster than anything else.