Since 2008, U.S. President Barack Obama has aged noticeably. As the presidential hair faded from pepper to salt, discussion began online on whether the pressures of office age leaders faster than the rest of us. Some experts say the answer to that question is no, but a dig through the archives reveals some remarkable differences in the aging of world leaders, from their first days in power to their latest -- or last.
The First And Last (Or Latest) Days Of Power

1
Syrian president Bashar al-Assad in 2000 (left) and 2015.

3
Former Libyan leader Muammar Qaddafi in 1975 (left) and 2009.

4
German Chancellor Angela Merkel in her first New Year's address in 2005 (left) and her latest.

5
US President Barack Obama in 2009 (left) and 2016.