Maybe it&#x27;s attributed to the rigorousness of the selection process but I have noticed the longevity of so many astronauts.<p>John Glenn, Neil Armstrong, Buzz Aldrin, Michael Collins and Edgar Mitchell all lived beyond the average life expectancy of American males born when they were born.<p>Our bodies have incredibly complex feedback loops and we evolved here, with a constant 1G of gravity.<p>It&#x27;s not surprising to me that exposure to Zero-G can have long lasting and unexpected consequences.