Perhaps our best hope is our growing obesity, which will lead to several life shortening diseases.

One can usually get to age 60 at least with obesity, but the numbers begin falling quickly after that.

yes, unless there is a breakthrough in the treatment of obesity (or a radical change in American habits), the long standing growth in American life-expectancy will likely decline due to obesity and its medical complications. here's a MSM article describing this penomenon:

http://www.cnn.com/2005/HEALTH/diet.fitness/03/16/obesity.longevity.ap/

On the other hand, maybe all our fat citizens will need all that blubber to make it through the winter in "The Long Emergency"...;o)