Sort of, but skinny when older still makes it easier to be happy. I am only 41 so far, but in hanging out with people older than me, it still held pretty consistent for them.
The main problem, of course, is that losing weight (or not putting it on in the first place) is not straightforward. So many people will tell you to “just simply…” not how it works. It’s complex as hell and varies a surprising amount from person to person. You could go to multiple experts for help before finding a solution for everything that was in your way specifically. But everyone acts like it should just be a simple thing “you just aren’t balancing your input and output”, or whatever their one simple trick is.
There could be any of hundreds of things in the way.
It’ll just be added to pile of hundreds of other invisible reasons why people are “too lazy to get a job”. So that the people suffering from them can be blamed instead of other people feeling bad for the situation they had either little or no control over being in. That’s the standard playbook response to this kind of thing. The sufferers are wrong to suffer, they should just be normal like everyone else. Not being normal is wrong. So they deserve to be poor or dead because they are the ones in the wrong.