|History of Arda|
| Years of the Lamps|
Years of the Trees
|Years of the Sun|
| First Age|
|Timeline of Arda|
Tolkien's writing does not provide information on more than the first few centuries of this age, so it is not known when it ended, if it ever did.
Tolkien said that he thought the distance between the end of the Third Age and the 20th century C.E. was about 6000 years, and that in 1958 it should have been around the end of the Fifth Age if the Fourth and Fifth Ages were about the same length as the Second and Third Ages. He said, however, in a letter written in 1958 that he believed the Ages had quickened and that it was about the end of the Sixth Age/beginning of the Seventh. (This letter is referred to in the "Fourth Age" article of The Encyclopedia of Arda as mentioned below.)
For a complete list of events during the Fourth Age, see the Timeline.