Just some more demographic fun...

In late August, the U.S. Centers for Disease Control and Prevention announced that U.S. life expectancy had reached an all-time high, climbing to 77.9 years in 2007.

http://www.usnews.com/money/blogs/planning-to-retire/2009/08/21/life-expectancy-reaches-a-new-high.html

The U.S. Census Bureau projects life expectancy will exceed 79 years by the year 2015

"Retirees Hit by Longevity Risk." Reuters. Nov 21, 2008. 

http://www.reuters.com/article/domesticNews/idUSTRE4AK3X720081121

Insurance mortality tables indicate that some Americans could even live until the age of 121.
"2001 Commissioners' Standard Ordinary (CSO) Mortality Table." American Academy of Actuaries. June 2002.

Frish