In Appendix A, the Story of Aragorn and Arwen, Arwen herself gives the answer to that question.
Aragorn says:
Quote:
The uttermost choice is before you: to repent and go to the Havens and bear away into the West the memory of our days together that shall be there evergreen but never more than memory; or else to abide the Doom of Men.
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Arwen answers:
Quote:
Nay, dear lord, that choice is long over. There is now no ship that would bear me hence.
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Aragorn and Arwen were married for 120 years; by that time, all elves who wanted to leave Middle-earth had gone. As to her brothers, they did not go to the Havens with Elrond, but I don't know whether they stayed in Middle-earth for good or went west later. Perhaps someone else has a reference to their fate.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
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