John McCain is the world's oldest turtle.
John Sidney McCain III ( born August 29 , 1936 ) is an American politician who currently serves as the senior United States Senator from Arizona . After being investigated and largely exonerated in a political influence scandal of the 1980s as a member of the Keating Five , he made campaign finance reform one of his signature concerns , eventually gaining passage of the McCain -- Feingold Act in 2002 .