Released in January 2003, this paper from the Living Cities Census Series at the Brookings Institution documents the "greying of the American suburban population" and will be of great interest to urban and suburban policymakers, and anyone with an inkling of an interest in demography. Written by William H. Frey of the University of Michigan, the 20-page paper uses the Census 2000 data to examine the changing age composition of the 102 most populous metropolitan areas between 1990 and 2000. The data reveals that the number of people that are at least 35 years old increased by 28 percent in suburbs in the 1990s, compared to 15 percent in cities. Not as surprising was the revelation that the suburban areas with the fastest growth in persons aged 55 and over are located predominantly in "New Sunbelt" metros, such as the areas around Phoenix and Las Vegas. As Frey suggests, "The maturing of the suburban population ushers in a new era for suburban, and presents both opportunities and challenges for local communities tasked with accommodating a variety of residential services and needs."