Time treats people (even rock stars) differentially.
Some look great: Billy Idol, Bret Michaels (who’s a mere 48, though, so it’s not a good test), and Bruce Springsteen. Pat Benatar looks better than in her youth, and David Bowie looks good without seeming to have had any cosmetic surgery, since his eyes are hooded in a way that’s normal as a person ages.
Meat Loaf looks better, too—but then he had almost nowhere to go but up. Other “goods” are Joan Jett, Van Halen, Tom Petty, Ted Nugent, Sting, Bon Jovi, and Annie Lennox.
The bad ones (and it’s not always due to weight gain, by any means) are Grace Slick, Mick Jagger in one of the worst photos ever of him (they really had to search for that one), Ozzy Osbourne, Iggy Pop (terrifying), the most dreadful photo of Dylan ever (he should sue), Ron Wood (scary), and Neil Young (my goodness).
No doubt some of this is the result of long-term and determined abuse of the body through good old sex, drugs, and rock and roll. The rest? Dunno. And probably some of the “goods” have done their share of partying, too.