Fictional age regression

Age regression is a popular theme in transformation fiction involving the physical and/or mental reduction in age. This age regression often occurs via magic, including potions or the legendary fountain of youth, or from a science fiction plot device. There are also some characters who are born adults and then age backwards, such as the protagonist of F. Scott Fitzgerald's The Curious Case of Benjamin Button, the Mork and Mindy character, Mearth, or Merlin in T.H. White's The Once and Future King.
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