Well, no-one know's for sure, of course, but we have made some educated guesses! 4.543 billion years is the best estimate we have today! Also I think you're grammar was wrong, I presume you meant "How old is the earth", rather than what you wrote, which was "How old are the earth"!
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence