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President John Kennedy delivers his State of the Union report to a joint session of Congress in the House Chamber on Capitol Hill in Washington on Jan.14, 1963. Behind the president are House Speaker John McCormick, at left, and Vice President Lyndon Johnson. When George Bush lifts off in his helicopter on Inauguration Day, leaving Washington to make way for Barack Obama, he may not be the only thing disappearing into the horizon. To a number of social analysts, historians, bloggers and ordinary Americans, Jan. 20 will symbolize the passing of an entire generation: the baby boomer years. (AP Photo, File)