If he makes his debut next season he might not even be the youngest player in the league.
More and more teams are going back to promoting elite prospects at a younger age.
I've been beating this drum for years, development can and will continue at the major league level.
How old was Griffey, A-Rod?, Soto, Harper, Machado? Was their development hurt by getting promoted aggressively?
Some players need to methodically advance through the minor leagues, some don't.