Alan Shepard was the oldest man to walk on the Moon, at least according to NASA (I love putting in that caveat). He was in his 48th year when he became the fifth Apollo astronaut to trod the lunar surface. 

Charles Duke, the tenth to do so, was in his 37th year — and the youngest — when he became peripatetic so far from home.

Four of these temporary selenites still survive. Eugene Cernan, who was the last astronaut to have walked there, died two years ago.

Buzz Aldrin and Edgar Mitchell, the second and sixth lunar perambulators, along with Apollo 15 command module pilot Al Worden, claim to have seen UFOs while manning their respective Apollo spacecraft, and took (and “passed”) lie detector tests to add weight to their claims. Mercury and Gemini astronaut Leroy Gordon Cooper Jr. — who was scratched from an Apollo mission — claimed, in his autobiography, to have seen UFOs not in space but as a pilot of an aircraft. 

Meanwhile, your spaceflight dreams could be made real, if you have enough money, or (this is a longshot) drive some backroads late at night and wander into a UFO amenable to hitchhikers or especially interested in probing your nether regions. Always wear clean underwear.