I'm a big fan of Bruce Springsteen, but it wasn't until recently that I became well-acquainted with his 1980 double album, The River. In my view, it's among his best. One of my favorite tracks is "Hungry Heart,” which I call attention to because, the first time I heard it, I immediately thought of "When I'm Sixty-Four." It's all in the vocal. When the Boss enters on "Hungry Heart," it doesn't sound quite right. That’s because his voice was sped up for the recording, which resulted in a higher pitch and an overall younger-sounding vocal. The parallels to "When I'm Sixty-Forty" are obvious: Paul had the same modification done to his voice, with the same result.
The song's connection to The Beatles doesn't end there. Wikipedia: "On the day of his murder in December 1980, John Lennon said he thought 'Hungry Heart' was 'a great record' and even compared it to his single '(Just Like) Starting Over.'"
Give it a listen:
(If the video is removed, go here.)