Most players in Majors will be 12 and 11 - years - old .
Qualified 10 and 9 - year - olds may also be drafted onto Majors teams if players attend the Player Evaluation Sessions .
Most players in Majors will be 12 and 11 - years - old , although qualified 10 and 9 - year - olds may also be drafted onto Majors teams if they attend the Player Evaluation Sessions .