Detroit, Michigan – Americans are holding onto their vehicles longer, with cars and trucks now at a record average age of 10.8 years, according to research firm Polk.

The average age of a car in July 2011 was 11.1 years, while the truck average was 10.4 years, with buyers keeping their vehicles longer largely due to unemployment and the economy.

The average vehicle age has been rising since 2008, but Polk said that a sales rebound last year is likely to slow the aging rate. There were 12.8 million vehicles sold in the U.S. in 2011, up from 11.6 million in 2010.

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