Answered February 29th, 2020

Jordan Staal is the youngest in a game with 1+ hat trick. He was 18 years and 153 days old against the Maple Leafs on February 10, 2007.

who was the youngest player with 1 hat trick in a game
Interpreted as:
Who was the youngest player with 1 or more hat trick in a regular-season game?

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