*All* the Elves certainly do not leave Middle Earth at the end of the Third Age, not even all the great among them. Celeborn, Thranduil and Legolas are all specifically said to have remained - for a time at least.
Tolkien speaks 'faded' Elves, now immaterial, who still commune with chosen Men in our own day. And of evil Elves, disincarnates who hunger for bodies and might try to steal that of an unwary Man.
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