Ellie Jerome is a young-at-heart 75-year-old who relates more to her 25-year-old granddaughter, Lucy, than her 55-year-old daughter, Barbara. She's done everything she can to stay young, and the last thing she wants to celebrate is another birthday. When she sees all those candles on her cake, Ellie wishes more than anything that she could be 29 again for a day, and live the kind of fun and carefree life that Lucy lives. But the last thing she ever expected when she blew out her candles was for her wish to come true...