""So do people who have never been fat look younger? Or do fat people look younger than their age but then lose weight and look old like people who were always skinny?""
You can't really answer that. Lifestyle and genetics dictates how you look. Then there is skincare routines, beauty treatments etc. I lost weight (i'm still losing) and my face looked a bit crepey, so I've gone for HIFU and my I've bought a micro-needling wand. My skin is firmer and glowing again. I also use Hyaluronic Acid and Retinol/Peptides. I'm 51. I move like a much younger, fit, person, though. Which is more important to me. I'm looking forward to going on Fairground rides, once again, in August, with my Grandchildren. I'll be another half a stone lighter.
If I hadn't have lost the two stone that I did before this heat hit, I would have been largely housebound, or sitting down a lot.
That picture you posted is a bad one, in others, he looks really well. He may look his age, but I don't see the issue with that.
As mush as I chose to pay out, to improve my appearance, it shouldn't become compulsory.
As said, it's better than being housebound, having numerous hospital appointments/medication, or dead.