Bucky Harris was 27, when he was chosen to be the manager of the Washington Senators, on February 10, 1924. The Senators would go on to win the World Series making Harris the youngest manager to win a World Series. Boudreau was 30 when he guided Cleveland to the Title.
Both men have been inducted into the Baseball Hall of fame.
Roger Peckinpaugh was 23 when he was named interim manager of the New York Yankees in 1914. He managed the final 20 games of the season and had a record of 10-10. Interestingly, Peckinpaugh was Harris' shortstop on the 1924 Senators that won the World Series over the New York Giants.
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Roger Peckinpaugh.
Peckinpaugh took over as player/manager of the 1914 Yankees from Frank Chance with 20 games left in the season. He was 23 years old.
He managed the final 20 games of the season and was replaced at the start of the 1915 season by Bill Donovan. Peckinpaugh continued playing for the Yankees through the 1921 season.
In 2014, the youngest manager in Major League Baseball was Mike Matheny. He is not the youngest however. He is the 14th youngest ever.