Races of Middle Earth 4/6(?): Elves
In Tolkien mythology, the Elves were the first children of Eru, the One, whom they called Ilúvatar. The Elves are not subject to disease or physical aging, though they could be killed by violence or by wasting away and losing the will to live. They were otherwise essentially immortal.
Some, known afterward as the Eldar (People of the Stars), were brought by the Valar from Middle-earth to Valinor across the Sea, where they were taught by the Ainur. But after the Silmarils were stolen by Melkor, some of the Elves returned to Middle-earth, where they remained until the end of the Third Age(x)