Bobby Jay said:
Have I missed anything?
He's also one of the founders of the Jedi Order and the inventor of the lightsaber. The reason he's still alive after all these countless centuries is because, as the Jedi who prophesied the coming of the Chosen One, the Force deemed he must remain alive until the day the prophecy came to pass. He died shortly after giving Luke the necessary info on how to recreate the Jedi Order.