Answered January 10th, 2020

Patrick Mahomes was the youngest quarterback in a game with 400+ passing yards in 2019. He was 23 years and 363 days old versus the Oakland Raiders on September 15.

who was the youngest qb with 400 yards in a game last season
Interpreted as:
Who was the youngest qb with 400 or more passing yards in a regular-season game last season?

See Trending NFL Searches