The song is sung by a young man to his lover, and is about his plans of their growing old together. Although the theme is ageing, it was one of the first songs McCartney wrote. Beatles historian Mark Lewisohn suggests it was McCartney's second composition, coming after "Call It Suicide" but before "I Lost My Little Girl". It was in the Beatles' setlist in their early days as a song to perform when their amplifiers broke down or the electricity went off. Both George Martin and Lewisohn speculated that McCartney may have thought of the song when recording began for Sgt. Pepper's Lonely Hearts Club Band in December 1966 because his father, Jim McCartney, turned 64 earlier that year.
