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#1Barack Obama Age:50 NEW YORK, NY - SEPTEMBER 20: U.S. President Barack Obama attends a bilateral meeting with Turkish Prime Minister Recep Tayyip Erdogan during the United Nations General Assembly September 20, 2011 in New York City. The 66th session of United Nations General Assembly kicks off September 21, with leaders from around the world attending. #2Vladimir Putin Age:59 Russian Prime Minister Vladimir Putin seen during a meeting with officials in Moscow, Wednesday, Oct. 5, 2011. #3Hu Jintao Age:68 China's President Hu Jintao attends a joint press conference during the BRICS summit in Sanya, Hainan Province, China, Thursday, April 14, 2011. #4Angela Merkel Age:57 Angela Merkel, Germany's chancellor, speaks during a news conference at the Federal Chancellery in Berlin, Germany, on Thursday, Oct. 6, 2011. The European Commission is pushing for a coordinated capital injection for banks to shield them from the fallout of a potential Greek default as Germany urges each country to prepare its own blueprint. #5Bill Gates Age:56 SYDNEY, AUSTRALIA - DECEMBER 15: Bill Gates, founder of Microsoft, poses for a portrait on December 15, 2011 in Sydney, Australia. (Photo by Danielle Smith/The Sydney Morning Herald/Fairfax #6Abdullah bin Abdul Aziz al Saud A picture dated January 15, 2009 shows Saudi King Abdullah bin Abdul Aziz al-Saud at a Gulf Cooperation Council summit in Riyadh. King Abdullah warned on March 18, 2011 that security forces will "hit" whoever "considers" undermining the kingdom's security and stability, in an audio speech aired on state-television, coupling the warning with an announcement of massive social benefits including higher unemployment payments, better health care and improved housing.