In the piece Harry links to, there is the following observation:
"I'm not sure our readers are clinging to their youth," says David Hepworth, co-founder of The Word with Mark Ellen. "The point is, they don't believe they've ever got old. They'll do what they like until they fall down. Women, for all sorts of body clock reasons, always know exactly how old they are; but men, in their own heads, are perennially 37. What's more, they're blessed with a magical ability to look in the mirror and disregard all the evidence to the contrary."