Youth Without Youth (2007)

1938, Romania: at 70, a professor of language and philosophy, Dominic Matei, contemplates suicide: the love of his life is dead, and he remains unable to complete his life's work on the origins of language. Then, he's struck by lightning. After a slow recovery, he grows younger. He must now avoid Nazis, who want to study and experiment on him. Some years later, he meets a young woman who has her own passage through a lightning storm. Not only does Dominic find love again, but her new abilities hold the key to his research. Is the sweetness of life finally at hand?