Earnedil made this choice, and he chose the to be of the first people for the sake of his wife. His children were also given this choice: Elros chose mortality and founded a kingdom. Elrond chose to be an elf (half-elven only refers to his heritage- he was around from near the end of the first age), but it had a hitch- when the time came, his children would have to choose between accompanying him to Aman, or forsake their immortality and stay behind. Arwen forsook her immortality when she chose Aragorn, just as her foremother had done ages before. Thus they were both like the Numenoreans of old, living lives longer than most of the past kings of Gondor, but nevertheless mortal. Their children would likely be similar in lifespan.
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