The life expectancy figures cited by grandparent are based on a starting age of "zero". A lot of kids don't make it to age five, many due to car accidents. Once you've made it to age five, the "average life expectancy" of the remaining pool has gone up quite a bit.
As you move up the population pool age brackets, you have already lost the people who were going to bring down the average. To state otherwise brings you to the situation where you're introduced to an 85 year old man and say to him "you should have been dead five years ago!"
I'm pretty sure all the astronauts in the statistical pool started at an age of "zero". Joking aside, if you remove people in the statistical pool that died at a younger age, it is no longer the average life expectancy. To state otherwise brings you to the situation where you're at a funeral for a 102 year old man and say to his kids "he should have lived another three years."