Young Digerati are the nation's tech-savvy singles and couples living in fashionable neighborhoods on the urban fringe. Affluent, highly educated and ethnically mixed, Young Digerati communities are typically filled with trendy apartments and condos, fitness clubs, clothing boutiques, casual restaurants and all types of bars—from juice to coffee to microbrew.

The steady rise of older, healthier Americans over the past decade has produced one important by-product: middle-class, home-owning suburbanites who are aging in place rather than moving to retirement communities. Gray Power reflects this trend, a segment of older, midscale singles and couples who live in quiet comfort.

With a population that's 50 percent Latino, Big City Blues has the highest concentration of Hispanic Americans in the nation. But it's also the multi-ethnic address for downscale Asian and African-American households occupying older inner-city apartments. Concentrated in a handful of major metros, these young singles and single-parent families face enormous challenges: low incomes, uncertain jobs and modest educations. More than 40 percent haven't finished high school.