There's a saying that presidents age twice as fast while in office. Take a look back over the past 60 years of U.S. presidents and judge for yourself how much the office aged them.
Then a candidate for a U.S. Senate seat in Illinois, Barack Obama is seen here speaking at the 2004 Democratic National Convention on July 27, 2004, in Boston. He was 42 years old at the time.
Here, President-elect Obama is seen walking with President George W. Bush during a visit to the White House on Nov. 10, 2008. Obama was 47 years old at the time.
Take a look at President Obama here in April 20, 2011, when he was 49.
Finally, here's a more recent image of President Obama, speaking at a campaign rally in Milwaukee, Wis., on Sept. 22, 2012. He is 51 years old in this image.
Republic presidential candidate and Texas Gov. George W. Bush speaks following a primary night victory on March 14, 2000. Bush was 53 years old at the time.
President George W. Bush makes a point during a rally in Dubuque, Iowa, on May 7, 2004, as he seeks re-election to a second term. He was 57 years old at the time.
With less than a month left in his second term, President George W. Bush speaks on the phone with Palestinian Authority Prime Minister Salam Fayyad from his office at his ranch in Crawford, Texas, on Dec. 30, 2008. Bush was 62 when he left office.
Here's a more recent look at President George W. Bush, during a Washington, D.C., event on May 15, 2012. Bush was 66 when this photo was taken.
Take a look as President Bill Clinton as he looked in his January 1993 official White House photo, less than a month into his first term. Clinton was 46 years old when the photo was taken.
After winning re-election in the 1996 election, President Clinton delivers his inaugural address in front of the U.S. Capitol on Jan. 20, 1997. Clinton was 50 years old in this photo.
President Bill Clinton delivers his farewell address to the United States from the Oval Office at the White House on Jan. 18, 2001. He was 54 years old at the time.
Now, a present-day look at former President Bill Clinton, as he answers questions onstage during an interview at the Peterson Foundation 2012 Fiscal Summit in Washington, D.C., on May 15, 2012. Clinton 65 years old in this photo.
Now, we move on to Clinton's predecessor, President George H.W. Bush, seen here in the Oval Office on Oct. 20, 1989, speaking with Egyptian President Hosni Mubarak during the first year of his term.
President George H.W. Bush is seen here golfing in Kennebunkport, Maine, on July 12, 1991. Bush was 67 when this photo was taken.
And here's a look at President George H.W. Bush shaking hands with President-elect Bill Clinton during a photo opportunity in the White House rose garden on Nov. 18, 1992. Bush is 68 years old in this photo.
Here's a 1980 look at both Republican candidates Ronald Reagan, then 69 years old, and George H.W. Bush during a debate in Nashua, N.H., moderated by John Breen (center).
This is President Ronald Reagan's official White House portrait, taken during his first month in office in January 1981.
Now, take a look at President Reagan with Vice President George H.W. Bush during the summer of 1984 at the Republican National Convention during their re-election campaign. Reagan was 73 years old in this photo.
President Regan gives a farewell salute as he leaves office on Jan. 20, 1989, in Washington, D.C. Reagan was 77 when he left office.
President Jimmy Carter is seen here on Jan. 31, 1977, less than a month into his term. Carter was 52 when this photo was taken.
Compare that earlier picture to this one of President Carter on April 7, 1980, during his last year in office. Carter was 55 years old in this photo.
Former President Carter is seen here talking during a news conference in Cairo, Egypt, on Jan. 13, 2012. Carter was 87 when this photo was taken.
Carter's predecessor was President Gerald Ford, who is seen here on Aug. 9, 1974, being sworn in by Supreme Court Chief Justice Warren Burger after the resignation of President Richard Nixon. Ford was 61 when he was sworn in as president.
Here, President Ford is seen in the Oval Office on Jan. 27, 1976, the beginning of his final year in office. Ford, who in office for less than two and a half years, was 62 when this photo was taken.
President Richard Nixon is seen here in July 1968 during his campaign for the White House. Nixon was 55 years old at the time.
Here, President Nixon is seen during his resignation announcement on Aug. 9, 1974. Nixon was 61 years old when he left the White House.
Lyndon B. Johnson taking the oath of office on Air Force One at Love Field Airport two hours and eight minutes after the Nov. 22, 1963, assassination of President John F. Kennedy in Dallas, Texas. Johnson was 55 years old when he was sworn into office.
President Lyndon B. Johnson on Jan. 9, 1969, 11 days before he leaves office. Johnson was 60 years old when this photo was taken.
President John F. Kennedy is shown here in a picture taken in February 1961, one month into his presidency. He was 43 years old when he was inaugurated.
President Kennedy would be assassinated on Nov. 22, 1963, just two years and 10 months into his first term. His was the seventh-shortest term as president. He is shown here on July 11, 1963, at the age of 46.
Dwight D. Eisenhower is seen here in a portrait taken sometime during 1952, the year in which he was elected to his first term as president. Eisenhower would have been either 61 or 62 depending on when this photo was taken in 1952.
Former President Eisenhower meets with President John F. Kennedy on April 22, 1961, three months after Eisenhower's presidency ended. Eisenhower was 70 when this photo was taken.