Rewind is a science fiction

Science fiction

Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

 novel

Novel

A novel is a book of long narrative in literary prose. The genre has historical roots both in the fields of the medieval and early modern romance and in the tradition of the novella. The latter supplied the present generic term in the late 18th century....

 by Terry England which is predominantly about the fate of a group of seventeen humans who are transformed into apparent 9-year-olds by extraterrestrial visitors to Earth. Although they retain their adult memories and personalities, they are legally regarded as children, which causes many difficulties.