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I have lived here for 10+ years, rarely see kids play out. Every other city I have lived, it's common to see a bunch a kids and teenagers.

All of these trends are temporary. Once the current residents die, either new singles move in, or maybe families if the city makes policy choices that are friendly.

The most important reason that I've heard of is that SF won't let you choose a school close to your neighborhood, so you can end up with kids in multiple schools across town, or in schools you don't like.