William Henry Harrison  (February 9, 1773 – April 4, 1841)

Harrison was the ninth President of the United States beginning on March 4, 1841
and was the first president to die in office. He was 68 years, and 23 days old when elected, the oldest president elected until Ronald Reagan in 1980. Harrison was  
also the last President to be born before the U.S. Declaration of Independence. He
died of complications from pneumonia.