Sesenta es anciano; no me importa cual es la definición. I think you are ignoring reality to say that Morrissey is ageless, or doesn't look his age. But that said, I think you may've missed my point: he looks very good for his age. I wouldn't say he's stunning for a sixty-year-old. If he wasn't a world-famous singer, I doubt he would be turning many heads.
But there's still an undeniable handsomeness there. I think the common parlance is "silver fox." Mind you, it's not a glamorous and smooth foxiness. There's a coarseness to it. In the pictures where he's got the Irish tan and is wearing a track suit windbreaker and some jewelry and is smoking a cigar, he looks like a (handsome) aging mid-level mobster. And in the ones where's he pallid and doughy and wearing a tweed flat clap, he looks like your darkly eccentric bachelor uncle, the one who's into Catholicism and smells like incense and quotes Father Feeney when rambling about the Jews—but nonetheless handsome, in a way that you wonder if he isn't a closeted Uranian who discloses homosexual trysts to the priest when he goes to confession. You might think to yourself, "I'd say Uncle Steven is probably rather attractive to a certain subset of young men."