I am sure over the moon is a century older than the 1970's, at least. In fact WIki[pedia implie sit derives from "Hey Diddle Diddle", which dates fromt he reign of Elizabeth I.


Excerpt:

It is likely that this poem is a satire of a scandal during the time of Queen Elizabeth I. The cat is Elizabeth I and the dog is Robert Dudley, Earl of Leicester, whom she once referred to as her 'lap dog'. It is also speculated that the 'dish' is a server at the royal court, whereas the 'spoon' refers to a taste-tester.



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