I saw the Stones play at Desert Trip, which Mick Jagger referred to as "Catch them before they croak" concert. Those guys were amazing and I kept thinking -- "Cool, so you can continue to succeed wildly in your career in your seventies.

I'm not a rocker or a performer. Er... maybe I should limit it to saying that I don't get up on stage to earn a living :) But I agree with your advice to acknowledge the passing of time.