Middleweight
Al McCoy: 19 years 5 months 14 days (I have 15 days)
He was born on October 23, 1894 and won the Middleweight Champion of the World, when he stopped George Chip in the 1st round on April 7, 1914.
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Mike Tyson was 20 when he beat Trevor Berbick for the WBC title in November 1986.
The previous youngest was Floyd Patterson who was 21 when he won the vacant title from Light Heavyweight Champion Archie Moore, after Rocky Marciano retired.
The youngest lightweight boxing champion was Muhamid Ali. He was considered a lightweight player at 205 lbs at age 17 and he was champion.