My suburban neighborhood has ~100 houses, and only two of them (besides mine) have children in them. Lots of grandparents, though, who briefly have children over around holidays. The landscape is dotted with parks but they're all pretty much always empty, except for the occasional adult exercising or walking their dogs. Our local school district is spread out over a huge swath of suburban land, likely because there are just not enough kids.

It's probably different in the city, where presumably more people are parent-aged. Almost all homeowners I know out by me are over 45 and their children are adults by now.