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Paratransit costs are going to skyrocket.

The nation’s suburbs are home to a rapidly growing number of older people who are changing the image and priorities of a suburbia formed around the needs of young families with children, an analysis of census data shows.

Although the entire United States is graying, the 2010 Census showed how much faster the suburbs are growing older when compared with the cities. Thanks largely to the baby-boom generation, four in 10 suburban residents are 45 or older, up from 34 percent just a decade ago. Thirty-five percent of city residents are in that age group, an increase from 31 percent in the last census.