Donald Trump could be the oldest first-term US president

Donald Trump will turn 70 years old
Donald Trump will turn 70 years old

Almost exactly one year after he announced his candidacy for the White House, Donald Trump turned 70 years old on June 14. The milestone puts him on pace to be the oldest first-term president in U.S. history if he's elected.

Ronald Reagan set the bar for elderly presidents in 1981. He was a couple weeks shy of his 70th birthday when he was sworn into office.

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By 2016 primary standards, Reagan was far from ancient. Younger hopefuls like Marco Rubio and Martin O'Malley quickly exited the race after being largely rejected by voters, while older candidates like Trump, Hillary Clinton or Bernie Sanders surged.

Donald Trump InsideGov

Trump has been quick to point out that he remains in excellent health as he approaches septuagenarian status. A report released by his physician in December "showed only positive results."

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"His physical strength and stamina are extraordinary," Dr. Harold Bornstein of Lenox Hill Hospital wrote.

While Trump would steal the title of oldest first term president from Ronald Reagan if elected, Clinton, who is 68 today, would be only a year behind him. Sanders would trounce them all if he wound up in the White House, turning 75 weeks before Election Day 2016.

U.S. Presidents InsideGov

Over the course of American history many older candidates have chased the highest office in the land. Republican presidential nominee in 1996 Bob Dole was 73 years of age during his big run, and John McCain was 72 back in 2008 when he lost to President Barack Obama who would become the fifth youngest president in history at age 47.