This photo of Gwen and Gavin gave us pause in the Never Underdressed office today. Was there something about Gavin that was a touch Dad-in-Urban-Outfitters error? We experienced an involuntary urge to give him some chinos to replace those dhotis. Then we looked up his age. He’s 47, people! Of course he looks weird in hi-tops. While 43 year-old Gwen still looks SoCal, ska-punk, slam-dunk hot.

It’s a heart-sinker akin to Fran Cutler turning 50 last May, simply because the domino thought process goes something like this: ‘Man, they’re getting old…. mahaha… oh…right…. that means I’m getting old also. Oh.’ When Gavin turns 50 he will join Phoebe from Friends, Johnny Depp and Tori Amos, who all enter their fifth decade this year.

So, you’re more likely to get a game of Articulate than wife swaps up on Primrose Hill these days. Your toddler’s more likely to pick up a cod liver oil capsule from the floor than some X.

Sadie Frost has been sober and a yoga-fiend for years now; Johnny Lee Miller gets rudely upstaged for roles by Andrew Lincoln (Walking Dead) and Lucy Liu (Elementary). Jude Law is Mr Napkin Head (shudder); Sienna Miller is all earth mother rather than Soho enfant terrible, while Rhys Ifans is just p-ing off the press by being obstreperous – when he’s not turning into a giant lizard in the Spiderman re-boot.

It was 21 years ago that Marc Jacobs was fired for his searingly spot-on Perry Ellis Grunge Collection. It was, in his words, ‘a little f*cked up’ and we loved it because it tapped into our style crush on Courtney Love’s kinderwhore vibe and the fact we wanted to be Evan Dando’s girlfriend, by featuring plaids, thermals, beanies and Doc Martens. (Love admitted recently that she actually burnt all the pieces Jacobs sent her as gifts: radness.)

And, jaw-drop, it’s nearly 20 years since Tom Ford became creative director at Gucci and steered them out of a nosedive with a sleek, sexed up show that made sales shoot up 90%. Around the same time the heroin chic Kate Moss furore kicked off and got really, really boring because people banged on about it for years.

We have skinny jeans that are now a decade old. We used to wear them with knee high boots, for f’s sake, whatwerewethinking?! It seems like yesterday that we were eyeing ballet flats suspiciously, wondering if our mother’s ‘driving shoe’ was really now acceptable, but that was nearly ten years ago.

Swivel camera to Angela Chase of My So-Called Life. It was 19 years, or a whole Justin Bieber, ago that Angela indulged in a misguided tryst with henna, obsessed over Jared Leto and leapt around her bedroom to Blister in the Sun in tie-dye. And we promptly did exactly the same.

The same year, The Rachel was requested in hair salons across the UK, and nobody managed to pull it off. No-bo-dy. Axl Rose was kind of hot. He now looks like this.

As for Britpop icons, well, Justine Frischmann, she of Elastica awesomeness who we wanted to BE, never did marry Damon Albarn. She married an atmospheric science professor in a nice tan suit, took up art, moved to San Francisco and now has no TV. Dave of Blur is 49 and a solicitor. Sleeper's Louise Wener is 47, has two toddlers and now, she says, listens to CBeebies theme tune all day. We won’t even talk about Alex James.

We’ll leave you with this, to remind you of the days when Leonardo Dicaprio was still hot and not a bit of a sad serial modeliser, cargo pants were ace and your most pressing dilemma was whether you were a Heather Shimmer or Coffee Shimmer kinda girl.