I just noticed this old piece via Marginal Revolution:
Aside from its wealth, the single defining feature of über-Washington is its youth. Most of the people who have moved to Washington since 2006 have been under 35; the region has the highest percentage of 25-to-34-year-olds in the U.S. “We’re a mecca for young people,” Fuller says. One recent arrival says word has gotten out to new graduates that Washington is where the work is. “It’s a place where a liberal-arts major can still get a job,” she says, “because you don’t need a particular skill.”
My emphasis added of course.