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Mildred Wilson and her son Danny during Tough Mudder's Missouri 5K. See SWNS story SWNYmud. This octogenarian has just completed her THIRD Tough Mudder, one of the most grueling endurance events in the world. Mildred Wilson, 83, is the oldest person ever to complete the brutal course.Tough Mudder is an endurance race filled with punishing obstacles such as a giant ice bath, a 60-foot watery trench under a steel fence, a dash through 10,000 volts of electricity and a 12-foot wooden ladder with giant rungs named the “Ladder to Hell.”“I knew last year I would do another as long as my health was good,” said the former vending machine company worker from Sikeston, Missouri.