In 1941, 38 years later, the Japanese bombed Pearl Harbor. (Mount Rushmore was completed in 1941).
In 1969, just 28 years after that, man landed on the moon. In 66 years man went from flight a few feet off the earth to flying to the moon.
In 2012, 109 years after the Wright brothers flight we landed a craft on Mars and it is communicating back to us with pictures.
Wikipedia lists the names of 41 people born during or before 1903 that are still living.