Josh (Ben Stiller) and Cornelia (Naomi Watts) are a middle-aged married couple struggling to keep up with their quickly ageing bodies and still feeling like they're in their twenties. They're tired of pretending to be grown up and the thought of having children becomes an evermore difficult decision. Filmmaker Josh soon meets a 25-year-old couple named Darby (Amanda Seyfried) and Jamie (Adam Driver); a couple that still have their whole lives ahead of them and bathe Josh and Cornelia in a comforting wave of nostalgia. Cornelia has reservations about spending their time with people so much younger than them, but it soon becomes clear that their presence has given Josh a new lease of life and made them realise that they don't have act the age they're expected to act, and they are free to let go to; that is, at least, until Josh is diagnosed with arthritis.

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