The only president from the 20th century, Clinton, 78, was in office from 1993 to 2001. Since then, the 42nd president has been involved in multiple charitable organizations.

Now, only four former presidents are alive, and only one of them was in office during the 20th century, US Today reported. Bill Clinton, 78 , is the only president from the 20th century.

No two American presidents have been the same. Not in policy and certainly not in popularity. There is one thing that unites nearly every Commander in Chief since the dawn of the 20th century ...