The "Third Age" refers to a period in J.R.R. Tolkien's fictional universe, particularly in his works like The Lord of the Rings and The Hobbit. It follows the Second Age, marked by the defeat of the Dark Lord Sauron and the decline of the Elves and Men. This age is characterized by the rise of kingdoms such as Gondor and Rohan and the growing influence of Hobbits. The Third Age lasts for about 3,000 years and concludes with the events of the War of the Ring. It is a time of struggle against remnants of evil, including Sauron's return. The age ends with the departure of the Ring-bearers to the Undying Lands, signaling a significant shift in the world of Middle-earth.