How does Aragorn die in The Lord of the Rings The Return of the King?

Aragorn died after becoming king and having a son and several daughters. Aragorn had ruled justly for many years and, feeling old age coming on him, he told Arwen and his children farewell. He told his wife, "To me has been given a span thrice that of Men of Middle-earth, but also the grace to go at my will and give back the gift. Now, therefore, I will sleep." Aragorn did not wish to die when old age had made him withered and witless, so he lay down on the bed that was prepared for him and, giving the crown of Gondor to his son Eldarion, Aragorn, son of Arathorn, Dunedain and of the line of Elendil, passed away from Middle-earth.