Gigi and the Fountain of Youth (1985)

Once upon a time there was a king and a queen and they had a little girl named Princess Gigi. Gigi's royal parents told her that in order to govern their world wisely she would have to learn as much as she could about people, and the best place to do that was on Earth. Once on Earth, Gigi discovers an island with a secret garden where everyone is a child. In the garden she meets Peter who controls the fountain of youth which keeps everyone young. Together Gigi and Peter learn the importance of following their dreams as they fight to keep the power of the fountain of youth from getting in the hands of an evil organization.