Who are the top ten oldest presidents?

The top ten oldest U.S. Presidents while in office were...

1. Ronald Reagan (77.9)
2. Donald Trump (70.6 on 20 Jan 2017)
   
3. Dwight D. Eisenhower (70.2)
   
4. Andrew Jackson (69.9)
   
5. James Buchanan (69.8)
   
6. Harry Truman (68.7)
   
7. George H. W. Bush (68.6)
   
8. William Henry Harrison (68.1)
   
9. James Monroe (66.8)
   
10. James Madison (65.9)
    

The top ten oldest U.S. Presidents after leaving office were/are, as of 5 Jun 2015,...

1. Gerald R. Ford (93.4)
2. Ronald Reagan (93.3)
3. George H. W. Bush (90.9 on 5 Jun 2015; living)
4. Jimmy Carter (90.6 on 5 Jun 2015; living)
5. John Adams (90.6)
6. Herbert Hoover (90.1)
7. Harry Truman (88.6)
8. James Madison (85.2)
9. Thomas Jefferson (83.2)
   
10. Richard Nixon (81.2)