“As old as Methuselah’s cat”

The informant often heard the saying “as old as Methuselah’s cat” from their family who said the saying was often used around Irish crowds, as well as commonly in Ireland. It can be used to state a rule is “as old as Methuselah’s cat,” when talking about someone’s age, and so on. The origin is not concretely said to be Irish but used by Irish people as they are often very religious and Methuselah is an old figure in Christian and Catholic religion. Multiple variations are also used by changing the name of Methuselah to something else.