That is quite possibly one of the best examples of a writer who has no idea what he is writing about. Why on Earth would U2 stop touring when their latest album has sold millions of copies and swept the grammy's, their concerts sell-out in hours and they are considered the world's biggest band? 45 is not "old".
I agree that some of the bands listed are way over the hill and probably should hang it up before one of them actually dies on stage, but if their concerts continue to sell out why should these bands be somehow forced to retire? Yes the Rolling Stones are old, sound like a shell of their former selves and, quite frankly, look ridiculous on stage. But old people continue to shell out $400 a ticket to see them play. It's their money and if they want to waste it on a bad concert, so be it.