Definitions for "Preteen"
A Preteen or pre-teen refers to a stage of human development during childhood. Typically a preteen is eight years old or older and is not yet adolescent (that is, has not yet undergone puberty).
a preadolescent boy or girl (usually between 9 and 12 years of age); "little league is intended for the preteens"
of or relating to or designed for children between the ages of 9 and 12; "a preteen party"; "preteen clothing"