Thomas Jefferson died on July 4, 1826, at the age of 83. John Adams died the same day, and he was just a few months short of his 91st birthday. Other long-lived Presidents are James Madison, who lived to be 85, Harry Truman who lived to be 88, and Herbert Hoover who died at the age of 90. President Gerald Ford is still going on strong, and will turn 91 this year. But Ronald Reagan holds the record of longest-lived President, as he is now 93. It is amazing how Reagan managed to remain in great physical shape throughout his...