teenybopper
noun/ˈtiːnibɒpə(r)/
/ˈtiːnibɑːpər/
(old-fashioned, informal)- a young girl between the ages of about 10 and 13, who is very interested in pop music, fashionable clothes, etc.
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teenybopper
Definition of teenybopper noun from the Oxford Advanced Learner's Dictionary