I agree with you, and I’m not being ageist at all.
All the entertainers you mentioned are pioneers and are incredible role models.
However, if Tina Turner was unable to walk anymore could she have run around on stage like she once did? If performing one show left her bedridden for a moth afterwards would it be a good thing for her?
All I’m saying is that if performing is causing the pain and health ailments that render the performer unwell and in pain, it’s time for them to rethink if they should keep doing it.