Michael Phelps and wife Nicole Johnson

US swimming great Michael Phelps, 32, revealed that he has battled depression for much of his life which drove him to consider suicide after his success at the 2012 Olympics. Speaking at a mental health conference in Chicago recently, the 23-time Olympic gold medal-winner said: "After every Olympics I fell into a major state of depression," the 32-year-old Phelps said. Phelps said he reached rock bottom following the 2012 Olympics in London, where he won four gold medals and two silver.