How many men are still alive that walked on the moon?

As of October 2023, there are four astronauts who walked on the Moon still alive: Buzz Aldrin, David Scott, Charles Duke, and Harrison Schmitt. They participated in the Apollo missions that landed on the lunar surface between 1969 and 1972. Their contributions to space exploration remain significant as they are part of a very select group of individuals who have experienced walking on another celestial body.