While college towns and retirement communities represent extremes, there are also age trends in urban and suburban areas, says William Frey, a senior fellow at the Brookings Institution’s Metropolitan Policy Program. “Suburbs are aging more rapidly than cities, due to the fact that baby boomers were a big part of the suburbanization of the United States in the ’50s and ’60s,” he says. “They grew up there, and now they’re like anchors of the suburbs.”¶{Excerpt}