Lunar-module pilot, Apollo 17
Age: 74
Life as an astronaut: The lunar program almost expired before he got his chance to fly, but his degree saved him; he was moved up from the canceled Apollo 19 because NASA wanted at least one trained geologist to visit the moon
Life as a civilian: Served a term as Senator from New Mexico, 1977-1983; has worked since as a professor, an author and a business consultant