More people in Australia look like Alf from Neighbours than Mike from Neighbours. I used to joke that you could tell exactly how far you were from Sydney. Because in Sydney you'd get a salad with some steak bits. Then gradually as you moved away, a few chips/less salad, Eventually massive steak, all chips, no salad (maybe a garnish).
That was 20 years ago though. Maybe it's better now.
Countries like DR Congo are not the majority though. The majority of the world's population now lives in middle income countries like China, India, Brazil, Indonesia and Mexico.
This is true but even in these countries, the majority of people are poorer, younger and slimmer. With a billion people though, that's an awful lot of older, fatter people. And the median age is definitely approaching us.