The decendants of Elladan and Elrohir had now choice. With the generation of Elronds Children the choices came to an end. They had the choice to go with their father into the west or to become mortal. Tolkien mentions in one of his letters that Elladan und Elrohir had delaied their choice. That means they were allowed to stay in Middle-Earth and follow thier father later or stay for ever and become mortal. In additon it is told of Arwen that she had the youth of the Eldar as long as Elrond was in Middle-Earth (or she choose to become mortal).
When we take these together it could mean that Elladan and Elrohir started to age swiftly as Man (supposedly as such Man of kingly numenoren blood in the early second age) do, when Elrond left. They were still allowed to sail west and the aging would stop in Eressea, but if they stayed in Middle-Earth they would inevetablely die.
Arwen on the other hand had made her choice and not delaied it. She couldn't sail west.
We do not hear of any wife of the twin-brothers. And I suppose that to marry they had to make their choice explecit as Arwen did. May be the concept was even more subtle: Tolkien had a strong belive in traditional view of marriage. If you become devoted to some one enought to marry her/him than you would like to shaer her/his fate.
Respectfully
Findegil
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