Lamar Jackson is the youngest quarterback with 1+ carry, when he has had 3 or more (ATT+TD) and has had 0 or more (INT+TD) in a playoff game. He was 21 years and 364 days old in the 2018 AFC Wild Card game versus the Chargers on January 6, 2019.

youngest qb with 3 pass+ tds, 1 rush, 0+ int+ td in a playoff game,
Interpreted as:
youngest qb with 3 or more pass+ passing tds, 1 or more rush, 0+ passing int+ passing td in a playoff game,

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