The Center for Retirement Research at Boston College maintains a national retirement index that measures the percentage of Americans who are at risk of being unable to maintain their standard of living in retirement.

The most recent index results, which incorporate the impact of the financial crisis, reveal that 51 percent of Americans are at risk of being unable to maintain their standard of living in retirement.

This is a 7 percent increase from the previous index results.

Factors attributing to the increase include real estate and equity market dislocations as well as an increase in Social Security's full retirement age.

Source: The Center for Retirement Research at Boston College

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