The flight of families with children, especially those of school age, is leaving San Francisco 
older, whiter and richer. And, not coincidentally, with the lowest percentage of kids—13.4 percent—of any big city in the country. That’s the takeaway from a special Board of Supervisors hearing yesterday to help explain why the city is bleeding families with children.
Add: Among other things, the Chronicle’s Heather Knight reports that as of last year, a family of three earning $111,000 a year could afford just 23 percent of homes for sale. Just 2 percent of housing units built in San Francisco since 2001 are single family homes. And according to the latest Census, the city has 8,000 fewer school age youths than in 2000.
