I wish Brian would hang it up. The last time I saw & heard him live I was left depressed for days. It was a pathetic spectacle.
As for McCartney: I’m curious who his current audience is. Nobody I know. But he still appears to be making quality music, even if I myself long ago lost interest.
Now Dylan, he’s even older, and doesn’t seem to be running out of steam; still making good albums, and the last time I saw him live he was fantastic. As for The Stones: the last time I saw them live, I lasted three songs. Terr-i-ble.