Answered January 12th, 2020

Patrick Mahomes is the youngest quarterback with 5+ passing touchdowns in a playoff game. He was 24 years and 117 days old in the 2019 AFC divisional game versus the Texans on January 12.

youngest qb with 5 tds in a playoff game
Interpreted as:
youngest qb with 5 or more passing tds in a playoff game

See Trending NFL Searches