I'm of the same era. But I was never a fan of the Beatles. At the time in England, there were a lot of pop groups, just as popular some more so than the Beatles and anyway I was more into jazz and Motown. My joke was inspired by this 1973 album cover, of which a staged photo was used by the BBC to promote a pretty average "cop show." of which I found I couldn't manage to watch more than a few episodes. A sobering thought is that, of the nine people featured on this album cover, those who are still alive, are just Paul McCartney and the boxer John Conteh.
An old man was following his wife upstairs. After a few steps he remarked, “Yer gettin’ so old that your backside looks like an old washing machine.” The wife says nothing and proceeds up the stairs. After they had climbed into bed, the old man got a little amorous…you know…frisky, right? As he hugged his wife she said, “I am not going to start up this old washing machine for such a small load. You are gonna hafta hand wash it.”