<P> In "The Tale of Aragorn and Arwen" that is found in Appendix A, Tolkien depicts a Middle - earth where most Elves have already left . The majority of those who remained lived in Mirkwood, while a much smaller population was in Lindon . Aragorn speaks of the empty garden of Elrond in Rivendell . Most strikingly, after Elessar's voluntary death, Arwen flees to a Lórien that is depicted as wholly abandoned, and gives up her own spirit in its sad and silent confines . </P> <P> As told in The History of Middle - earth and in Tolkien's Letters, Elves had a different life cycle from Men . Most of the following information strictly refers only to the Eldar, as found in his essay Laws and Customs among the Eldar, found in Morgoth's Ring . </P> <P> Elves are born about one year from their conception . The day of their conception is celebrated, not the actual birthday itself . Their minds develop more quickly than their bodies; by their first year, they can speak, walk and even dance, and their quicker onset of mental maturity makes young Elves seem, to Men, older than they really are . Physical puberty comes in around their fiftieth to one hundredth year (by age fifty they reach their adult height), and by their first hundred years of life outside the womb all Elves are fully grown . Elven bodies eventually stop aging physically, while human bodies do not . </P> <P> Elves marry freely and for love early in life . Monogamy is practiced and adultery is unthinkable; they marry only once (Finwë, first High King of the Noldor, was an exception, as he remarried after his first wife died). </P>

Why are elves immortal in lord of the rings
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