IMO, too much money is being spent attacking the proximate causes of death (cancer, heart disease, etc.) but not enough is being spent attacking the root cause: aging. Yeah, if we cure cancer then life expectancy will go up some. But those who would have died of cancer are still going to grow older, become weak, and die of something. It seems like a more efficient use of resources to fight aging than to fight all the problems it causes individually.

http://www.nickbostrom.com/fable/dragon.html