For what it's worth, twelve men have walked on the moon. With the passing of Alan Bean, only four are surviving today. The ages of those four are 82, 82, 85, and 88, so it's safe bet that within a decade or so, there will be no one alive who has walked on an extraterrestrial body.

Alan Bean, a Navy test pilot and astronaut who walked on the moon and then spent two months aboard America’s first space station before leaving NASA and becoming an accomplished artist, painting moonscapes and space vistas that garnered widespread critical praise, died Saturday. He was 86.

NASA confirmed Bean’s death in a statement from his family, saying the former astronaut died at Houston Methodist Hospital after a short illness.