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Why then didn't Aragorn, also a descendant from a half-elf get to choose? or if not Aragorn, as he was far too removed, why not the first few kings of Numenor?
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It's in the details.
As I said, "because Elrond married a full elf, Celebrian, the choice was also extended to his children by her." Elladan, Elrohir, and Arwen had new immortal blood. That's how Tolkien explains it in Letter No. 153.
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The view is that the Half-elven have a power of (irrevocable) choice, which may be delayed but not permanently, which kin's fate they will share. Elros chose to be a King and 'longaevus' but mortal, so all his descendants are mortal, and of a specially noble race, but with dwindling longevity: so Aragorn (who, however, has a greater life-span than his contemporaries, double, though not the original Númenórean treble, that of Men). Elrond chose to be among the Elves. His children - with a renewed Elvish strain, since their mother was Celebrían dtr. of Galadriel - have to make their choices.
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The next, hypothetical step is Arwen, Elladan, and Elrohir - if they choose immortality and marry elves, do their children get to pick as well? No. Their decision had to be made by a) staying in Middle-earth (mortal) or b) leaving with or shortly after their father (immortal). Once in Aman, the bloodline's fusion into the elven is complete.