http://www.salon.com/technology/how_the_world_works/2011/01/12/social_security_and_life_expectancy/index.html....A study published by the Congressional Budget Office in 2008 found that "there is a growing disparity in life expectancy between individuals with high and low income and between those with more and less education."
The implications of a continued widening of the gap in life expectancy by socioeconomic status are clear for Social Security ... a widening gap would... reduce the program's progressivity -- the extent to which it redistributes resources from high-income to low-income beneficiaries on a lifetime basis.
The numbers tell as brutal a story of the consequences of socioeconomic stratification as one could ask for. The British researchers found that for the cohort of men born between 1972 and 1976, the average life expectancy of a member of the highest socioeconomic class was 71.9 and for the lowest, 66.5. For the cohort born between 2002-2005, life expectancy for those at the top had risen by 8.1 years, to 80. For those at the bottom, only 6.2, to 72.7. In 30 years, the "life-span inequality gap" had risen from 5.4 years to 7.3. A study on U.S. life expectancy by researchers at the U.S. Department of Health and Human Services came up with similar evidence of "substantial and increasing disparities in US life expectancy over time"; between 1980 and 2000 "the gap between the least-deprived and most-deprived groups widening from 2.8 years in 1980-82 to 4.5 years in 1998-2000."
The CBO theorizes that "differences in the availability of high-quality health care before age 65 and in lifelong health habits might play an important role" in explaining the different life expectancies for different socioeconomic ages. So perhaps in a country where everyone had access to good healthcare, there wouldn't be a growing disparity in expected life spans. But as long as that disparity does exist, and as long as it keeps getting worse, an across-the-board hike in the Social Security retirement age would be one of the most regressive ways we could "fix" the jewel in the American social welfare crown.