By Hanna Rantala LONDON (Reuters) -Actors Elizabeth Olsen and Miles Teller say their new movie "Eternity" combines comedy, romance and big philosophical questions. The movie is set in the afterlife, where people revert to the age at which they were at their happiest and have one week to choose their final destination. Teller and Olsen play older married couple Larry and Joan Cutler, who upon their arrival are shocked to meet Joan's first husband, Luke (Callum Turner), who died in the Korean War and has been waiting for her ever since. In addition to choosing her eternity, Joan must also pick who to share it with. "It makes people laugh, but it's surprisingly emotional because it's a sincere film," Olsen said at the movie's London premiere on Monday. "I think it makes us all reflect differe

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