Movie with the old (young but a relationship is old) couple

I only watched the beginning of the movie.
It was about the old couple, they look like 20s. Guy has a old car. They listen the music of the song from the tape. He was dropping his girlfriend off. When she got off the car, they say bye. Then she do their own love gesture (make a heart by their arms in down side)
The movie name was their name.
I do not know how it went the ending, but it was not an special genre, but romantic or romantic comedy.