• Forbes, Monday, August 15, 2011 9:30 AM

Some 36 million Americans were born between 1945 and 1955. While the affluent among them may favor high-end niches in Manhattan, Chicago's Gold Coast or San Francisco, most are exiting these areas.

Forbes' analysis of migration by Boomers in the past 10 years shows a 10.3% decline among core city dwellers, a loss of some 1.3 million people over the past decade. Forbes used demographer Wendell Cox to parse data from the Census.

In Forbes' ranking of the 51 largest metros in the U.S., the urban cores of San Jose, San Francisco, Los Angeles and Chicago scored near the bottom with double-digit percentage losses of Boomers. In the recent Census, New York lost 12% of Boomers in their mid-50s to mid-60s -- or about 274,000 people.

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