At what age in a musician's or an artist's career should they just stop performing live?

At what point is it nothing but ego?

Sometimes, my articles can be a little brutal. I believe in being honest about having an educated opinion about the things I know. I know music, and I have my opinions. An opinion should be the result of thought, not a substitution for it. So, at nearly 62 years of age, I really don’t want to hear my rock star influences from 50 years ago, performing on…