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The events within the Third Age, lasting 3,021 years, form the backbone of Tolkien's most well-known works. Following Sauron's defeat, the age witnessed the rise and fall of kingdoms, culminating in the monumental struggle for the One Ring. The conclusion of this age was marked by the destruction of the Ring and, consequently, the defeat of Sauron, bringing about what would be termed the Fourth Age.
What Lies Ahead: The Fourth Age
The beginning of the Fourth Age ushered in a time dominated by men, marking a decline for other races in Middle-earth. The exact duration of the Fourth Age remains undetermined, and it is hinted that contemporary reality itself may reflect the ongoing evolution of this age.