Teenybopper

Noun

 * 1) A person, especially a female, in her early teens who follows popular clothing fashions, music trends, and the like.

Thesaurus
Babbitt, Middle American, Philistine, adolescent, anal character, babe, baby, bourgeois, broad, burgher, chick, colleen, compulsive character, conformer, conformist, conventionalist, cutie, dame, damoiselle, damsel, demoiselle, doll, filly, fledgling, formalist, frail, gal, girl, girlie, heifer, hopeful, hoyden, infant, jeune fille, jill, junior, junior miss, juvenal, juvenile, lass, lassie, little missy, mademoiselle, maid, maiden, methodologist, middle-class type, minor, miss, missy, model child, nymphet, organization man, parrot, pedant, perfectionist, piece, plastic person, precisian, precisianist, pubescent, romp, sapling, schoolgirl, schoolmaid, schoolmiss, sheep, skirt, slip, sprig, square, stripling, subdeb, subdebutante, subteen, subteener, teenager, teener, tomato, tomboy, trimmer, virgin, wench, yes-man, young creature, young hopeful, young person, young thing, younger, youngest, youngling, youngster, youth

Etymology
Coined in the 1950's from “teeny” (teenage) + “bopper” (one who dances to the form of improvisational jazz popular at the time)

Alternative forms

 * teeny-bopper