Does anyone know of somewhere in America where it is common for children to play semi-unsupervised with lots of other children of different ages? I grew up in a super-block like setting and you could look out and see your kids play but most of the time you didn't and they'd form groups with kids of ages above and below theirs and work out some relatively fair way to play a game and have fun.

Usually sports, but sometimes something else. I actually really enjoyed this sort of setting. Kids would get hurt accidentally, there were some harmless fights, and that sort of thing.

I'm just concerned that, independent of my own viewpoint on the subject, I will be unable to find sufficient other parents with this approach, or, should I find them they'll be clustered with other beliefs that I think are suboptimal for success.

Ultimately, if there is a place with this culture then I will try to make it so I can reasonably live there.