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The average lifespan of the astronauts that did not walk on the moon might be even longer than the ones that did.

I mean, you don't have any data (or evidence) on that one way or the other; do you?

ADDED. Oops: the comment 3 levels above gives data. I regret wading into this thread.

What about backup crews as a control?

Incredibly small sample size, but aren’t they all

For Apollo, the backup crew became the main crew two missions later (politics intervened on the last couple of missions, but this generally held true for all the manned Apollo missions).

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