Elsewhere, Gabrielle Zevin

Even in death, Liz can't get a break. After her untimely demise at 15, she finds herself in Elsewhere, which is a lot like Earth. People have homes, families and jobs (Marilyn Monroe is a therapist!), and can even watch events on Earth through binoculars. But instead of growing up, everyone grows down, getting younger each year, until they are sent back to earth as newborns. Liz can't believe that she will never be 16 again!