So, i know that half-elven were given a choice to be one of the elves, or men, but i just wonder how does they do that?
The only choice was mentioned was Earendil. He made his choice in front of Manwe, in Valinor, so i can imagine that the great Valar touch his "magic ward" on Earendil's head and "Pooop!!" he became an elf with those fancy pointed-ears (lol). But what about other half-elven? Do Valar meet them in their dream and ask them: "ok which kin you want to be?" If so, when? When they reach adult age? When they marry (another elf or human)? Could a half-elf chose to be elf, but then fell in love with a mortal and said: "Sorry gods, suddenly i think elf is gay, i want to be a mortal."? But somehow, it still doesnt sound right to me.
Probably it doesnt like an immediate choice...
At first i thought probably they need to go to Aman and live there a while to become an elf. If they stay in middle-earth, they can live longer other human, but finally the power of the elf will fade and they getting old and die.
But then i remember Elrond and his sons have never been there untill after the war of the ring, but age doesnt effect on them and they are still counted as elves.
Then i thought, ok, probably you need to live in the elven realm if you are a half-elf. Some kind of "magic" there would keep your elf-blood's power from fading. Example Arwen, when she lived in Rivendell, she's an elf, like her brothers, but when she married Aragorn and moved to Minas Tirith, she became a mortal.
So what is your theory?