preteenager
1. [ noun ] a preadolescent boy or girl (usually between 9 and 12 years of age)
Synonyms: preteen
Examples:

"little league is intended for the preteens"

Related terms: juvenile
Similar spelling:   pretender
  pretending
  pretense
  pretence
  pretended
  proteinase
  pretension
  proteinuria
  proteome