Via J.J. Cooper of Baseball America, he have a list of the youngest player in each professional baseball league. The two youngest big leaguers are Starlin Castro of the Cubs and Mike Stanton of the Marlins, two of just six players younger than 22. Jesus Montero is the sixth youngest player in Triple-A this year at 21 years and four months, trailing only Julio Teheran, Jose Iglesias, Jordan Lyles, Brett Lawrie, and Tyler Chatwood (who was called up the big leagues today).
Manny Banuelos is the fourth youngest player in Double-A, Scottie Allen is the sixth youngest in High-A, and Gary Sanchez is the second youngest in Low-A. The Yankees have a tendency to promote their top prospects aggressively, but in the cases of Montero and Banuelos, it’s certainly warranted.