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Being the leader of a country is tough.
The job requires tenacity, and strength in the face of criticism. Your decisions can affect millions of people, and that pressure can become too much for one person.
While the natural passage of time introduces wrinkles and crows-feet, the ageing process may very well be accelerated if you are the leader of a country - it's a bit stressful.
Here are some leaders pictured before they took office (left), and after (right):
Picture:Frederick M. Brown/Getty (Left, 2005. Right, 2015)
Under two years into his presidency, and the presidential seat is already too much for George W Bush.
Picture: Paul Buck and Alex Wong/Getty (Left, 2000. Right, 2002)
The right image - with just one year left of his presidency, Bill Clinton seems tired.
Picture: Helayne Seidman and Mario Tama/Getty (Left, 1992. Right, 2000)
Picture: Christopher Furlong and Georges Gobet/Getty (Left, 2008. RIght, 2013)
Picture: Steve Eason and Scott Barbour/Getty (Left, 1994. Right, 2006)
Picture: Hulton Archive/Getty (Left, 1977. Right, 1985)