How do the four classifications differ?
Every major league team has one AAA affiliate, one AA affiliate, two or three A affiliates and one or two rookie league affiliates. Typically, players, assigned to a rookie-level team are in their first or second year of professional baseball. Rookie-level teams begin play after the June draft each year and continue until the end of August. A-level players are more experienced and have played one to three years of pro ball and generally are 19-24 years old. AA-level players range in age from 21-28 years old and AAA players vary in age from 22-40 years of age.
