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weeny-bopper

British  

noun

  1. informal  a child of 8 to 12 years, esp a girl, who is a keen follower of pop music

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of weeny-bopper

C20: formed on the model of teenybopper , from weeny, as in teeny-weeny very small