The Return of the King
And Gandalf said: "This is your realm, and the heart of the greater realm that shall be. The Third Age of the world is ended, and the new age is begun; and it is your task to order its beginning and to preserve what may be preserved. For though much has been saved, much must now pass away; and the power of the Three Rings also is ended. And all the lands that you see, and those that lie round about them, shall be dwellings of Men. For the time comes for the Dominion of Men, and the Elder Kindred shall fade or depart."
"I know it well, dear friend," said Aragorn; "but I would still have your counsel."
"Not for long now," said Gandalf. "The Third Age was my age. I was the Enemy of Sauron; and my work is finished. I shall go soon. The burden must lie upon you and your kindred." (6.5.106-8)