With due respect, in practice it's essentially the exact opposite of what you're describing. During the Apollo program any sign of weakness or vulnerability wo

With due respect, in practice it's essentially the exact opposite of what you're describing. During the Apollo program any sign of weakness or vulnerability would be a reason to ground an astronaut, very likely permanently. So they regularly concealed absolutely anything and everything that wasn't directly expected or related to the mission. This included various forms of sickness or injuries, space adaption sickness, psychological issues, and more. Alan Shepard even managed to conceal symptoms of what would later turn out to be Meniere's disease. Aldrin was friggin touring around Antarctica in his 80s where he ended having to get on an emergency evac! It's not exactly a caution first attitude to life. In general the secret to longevity is healthy living, good diet, and a positive outlook on life. Even the Ancient Greeks had countless people living into their 80s and beyond.