Another term for Old English is Anglo-Saxon.
Proverbs, although wise sayings can be found in every book of the Old Testament.
Not always. Colloquialisms are old, common sayings, but slang is often new words and sayings.
Proverbs 1:6: "To understand a proverb, and the interpretation; the words of the wise, and their dark sayings."The phrase refers to the obscure sayings of the wise, probably their oracles.
A collection of sayings is known as a proverb, quote, aphorism, or maxim, depending on the context and cultural background. These sayings often express wisdom, advice, or observations about life in a concise and memorable way.
Old wive's tales, saws, allegorical advice.
Not always. Colloquialisms are old, common sayings, but slang is often new words and sayings.
The Paleolithic Age is called the Old Stone Age or Early Stone Age.
proverbs
The Book of Proverbs
willy nilly
The word you are looking for is "localism." This term refers to sayings or customs known only within a specific area or community.