He was one month short of his 40th birthday when he lost his last fight to Trevor Berbick in a non-title fight on December 11, 1981. This came 2 years after Ali's announced retirement in 1979.
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Muhammad Ali's final fight was a 10 rounder against future WBC heavyweight champion Trevor Berbick. The fight took place on December 11, 1981 in Nassau, Bahamas. Ali lost a unanimous ten round decision.