The Fourth Age of the Sun:

The Fourth Age of the Sun was the beginning of the Dominion of Men. The Rings of Power had either been destroyed or had lost their power, the Keepers of the Three and the Ringbearers had sailed into the West and a King had returned to Gondor. Aragorn, the first king of the Reunited Kingdom was crowned in the last years of the Third Age of the Sun, and died in the year 120 of the Fourth Age. This is the final Age recorded in the Red Book that we know of. The majority of the remaining Elves left Middle-Earth in this Age.