Judging from what Oedipus says about the age of his sons near the end of the play, roughly how old is Oedipus, and how long has he ruled Thebes?

We are never told how old Oedipus was at his death, but it is said that his sons are old enough to take care of themselves. This could mean almost anything, as young men went off to war and took care of themselves while only teenagers. We might judge Oedipus to be a man in his late thirties or early forties, but that is a guess on my part.