Conversation so far:
What language do the Malayali speak?
Malayalam is the language spoken by the Malayalis. Malayalam is derived from old Tamil in the 6th century.
Do the Malayali speak any other languages besides Malayalam?
No other language is spoken.
Any literary items of interest from the Malayali?
Booker Prize winner Arundhati Roy, whose 1996 semi-autobiographical bestseller The God of Small Things is set in the Kottayam town of Ayemenem, has gained international recognition.

Question: How old is their literature?
Self-contained rewrite: How old is Malayali literature?