1) Child 12 or younger 2) Immature 3) Little Leaguer 4) Little leaguer, typically 5) Many a little leaguer 6) Many a Nickelodeon watcher 7) Middle school entrant 8) Middle schooler 9) Preadolescent 10) Seventh grader 11) Sixth-grader, typically 12) Sixth-grader, usually 13) Still a kid 14) Twelve and under 1) Lad 2) Preadolescent 3) Pre teenager 4) Young 
[adj] - of or relating to or designed for children between the ages of 9 and 12 2. [n] - a preadolescent boy or girl (usually between 9 and 12 years of age)
preadolescent adjective of or relating to or designed for children between the ages of 9 and 12; `a preteen party`; `preteen clothing`
Also calleda boy or girl under the age of 13, esp. one between the ages of 9 and 12. · the years immediately preceding one's thirteenth birthday.