Answered March 16th, 2019

After a 40-point performance on Saturday, Devin Booker is up to 25.5 PPG in 2018-19. At 22 years-old, he's currently tied with Amar'e Stoudemire for the youngest Suns player to average 25+ PPG in a season.

Who is the youngest Suns player with 25 PPG in a season?
Interpreted as:
Who is the youngest Suns player with 25 or higher PPG in a season?