Just the same way you can be forty, carrying a little weight and hairy and gay but not think of yourself as a bear, so you can be young and slim and not think of yourself as a twink. But are all young skinny gay men twinks? Not necessarily. Youth is the main marker of a twink, young and boyish. Just what is a twink? It's not always easy to say, but one thing is really clear - they're young and slim and without a whole lot of body hair.