> I don't doubt that the people selected to walk on the moon were indeed fit and healthy, but it seems like a stretch to think that the people who flew on the e

> I don't doubt that the people selected to walk on the moon were indeed fit and healthy, but it seems like a stretch to think that the people who flew on the earlier Apollo missions were selected to less stringent criteria. It's not a stretch to think that the people who flew on the earlier missions could have been older on average, though. Just looking at some of the ages, 2 of the still alive crowd are younger than all of the Apollo 8 astronauts. All of them are younger than two out of the three Apollo 8 astronauts. Even a few years difference in age can make a huge impact when we're talking about people in their 90's.