Answered January 9th, 2018

Only three players have recorded 10 rebounds, 10 assists and 5 steals in a game before turning 21 in the last 30 years: Chris Paul, John Wall and Lonzo Ball.

Who is the last player to have 10 rebounds, 10 assists and 5 steals in a game, less than 21 years old
Interpreted as:
Who is the last player to have 10 rebounds, 10 assists and 5 steals in a regular season game, less than 21 years old?