> Hence my question: What happened?
What happened to a lot of activities kids used to do? They got replaced by ubiquitous internet-connected devices that allow them to watch any video or play any game at any time. They’d rather do that than play outside, and childhood obesity rates track well with these developments.
To put it another way, the neighborhood I grew up in 30+ years ago still exists, and the roads are the same size, the sidewalks are just as non-existent as they used to be, and there’s no more traffic than there used to be. But as you point out, sure there’s less kids out and about in the neighborhood when I was a kid.
But I would note two things about that. One, when I was a kid, there was much less inside that could occupy my time than there is today. And two, I’d argue that if you’re an adult who has to work all day during the summer, you may not be noticing how many kids are actually playing outside during the day.