Which is the oldest known written language still in continuous use?

Tamil is often cited as the oldest surviving classical language with a continuous literary tradition and everyday use. Tamil inscriptions date back to at least the 3rd century BCE, and its classical literature is among the oldest in the world. It is spoken by more than 80 million people, mainly in India and Sri Lanka, as well as in global diaspora communities. Because of its long history, Tamil has a rich body of poetry, grammar, and inscriptions.