<span style="color: #222222;">Former US president Jimmy Carter has reached a milestone. Elected as the 39th President, Carter is now the longest living chief executive in American history. Today is the 172nd day beyond Carter's 94th birthday. It exceeds by one day the lifespan of former President George H.W. Bush, who died last November at the age of 94 years, 171 days. Both men were born in 1924: Bush on June 12, Carter on Oct. 1.</span><br />” &nbsp;<br />