According to IMDB, it's been forty years ...
"If I spoke prose you'd all find out / I don't know what I talk about." -- Jeremy Hillary Boob -- the Nowhere Man
Lord Mayor: "Four scores and 32 bars ago, our four fathers"
Young Fred: "A quartet?"
Lord Mayor: "And four mothers"
Young Fred: "A Mother quartet?"
Lord Mayor: "Made their way in this yellow submarine..."
Young Fred: "What, that little thing?"
Lord Mayor: "...to Pepperland."
"Nothing you can make that can't be made.
No one you can save that can't be saved.
Nothing you can do but you can learn how to be you in time.
It's easy.
All you need is love. [...]"
... since Yellow Submarine premiered.