I think we are talking past each other.  People who are alive at 30 can&#x27;t die at 5, but people at birth could die at 5.  So, just by being 30+ or 60+ a populations life expectancy increases.  Which is why actuarial tables include ages.<p>So, to see if Astronauts are living unusually longer than other people you need to look at life expectancy&#x27;s of people who where 30 around 1960&#x27;s.<p>Now, they might sill be living longer than that group.  But, it does not seem like that&#x27;s the comparison your making.