"When I'm Sixty-Four" is a love song by The Beatles, written by Paul McCartney (but co-credited to John Lennon) and released in 1967 on their album Sgt. Pepper's Lonely Hearts Club Band. It is sung by a young man to his lover, and is about his plans of growing old together with her. Although the theme is about aging, it was one of the first songs McCartney wrote, when he was sixteen.
When I get older losing my hair
Many years from now
Will you still be sending me a valentine
Birthday greetings, bottle of wine?