I know there are several Korean movies about the love between an old man and a young girl. For example, in Fair Love, Ahn Sung ki in her fifties falls in love with her friend's daughter Li Hena, but Ahn Sung ki is a photographer. There is also the love between the retired old headmaster and the sexy female nurse in Night Near: Flowers of Desire. There is also a movie called "Young Mom: How Old am I", which is about the face of a young woman for three generations. The old man in it is a drugstore owner. You can have a look again.