Idiom of the day :- Been around since the flood

Usage, examples and definition of the Idiom :-

The Great Flood ( or Noah’s Flood ) written about in the Bible ( Genesis 7,8 ) happened a long, long time ago. For that reason, someone or something that has been around since the flood is very old. ‘I think these buses have been around since the flood.’ ‘I’ve heard that joke. It’s been around since the flood.’