It's possible that:
* It's a play on words: The phrase could be a humorous or ironic twist on the saying "The older the fiddle, the sweeter the tune," which is a more established idiom.
* It's a regional saying: It's conceivable that the phrase is used in a specific geographic area, but it hasn't gained widespread recognition.
* It's a recent invention: The phrase might be a new creation, perhaps used in a joke or a specific context.
Without further information or context, it's difficult to determine the origin of this phrase. If you have any additional details about where you encountered this phrase, it might help to understand its purpose and origin.