12 images of world leaders before and after they took office
Picture: Frederick M. Brown/Getty

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):

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