Elves are naturally immortal; like the Ainur, they are bound to Arda until its End. Elves are immune to all diseases, and they can recover from wounds which would normally kill a mortal Man. Nonetheless, Elves can be physically slain or die of grief and weariness.
In making that choice, Arwen gave up the Elvish immortality available to her as a daughter of Elrond, and agreed to remain in Middle-earth instead of travelling to the Undying Lands.
In the books and Legendarium, there examples of full-blooded elves (ex. Arwen and Luthien) who willingly sacrifice their immortality to spend a mortal lifetime with the humans they love.
Unlike the race of Men, they didn't physically age. They just remained constant -- an unchanging incarnation of their eternal form. Thus, once they were 100 years old, they looked the same for the rest of their lives. While Elves were done growing at 100 years old, they never stopped growing mentally.
While the date of Legolas's birth is unknown, he was likely born sometime after his grandfather was killed and his father took over the rule of the Woodland Realm. Like all Elves, Legolas is immortal. Elves do not die by natural causes; however, they can be killed in battle.
Immortality: Like other elves, Galadriel is immortal, meaning she can never die or grow sick or old. However, she is able to be killed if she fell in battle.
Partially this was due to the unique situation of their ancestry: because of the complications of being descendants of marriages between mortals and immortals, Elrond and his brother Elros were given the choice of their own fates, to be mortal with humanity or immortal with the elves.
Elves, at least the Eldar, have a pregnancy that lasts about a year. By the age of 1, Elves can speak, walk and dance. Puberty and full height are attained at around their fiftieth to one hundredth year, when they stop aging physically.
In Middle-earth, half-elves are the children of Elves and Men, and can choose either Elvish immortality or the mortal life of Men. The elf-maidens Lúthien and Arwen in Tolkien's works both chose mortality to be with the Men that they loved.
He is thought to be over 10,000 years old by the time the War of the Ring takes place, and in all those many long years, he is credited with saving the entire elven race, selflessly putting his own wants and desires aside for the good of all, and of being a vessel through which the divine could communicate with the ...
Elrond has only Half-Elf, and he was once given the choice to be counted among Man or Elves. When he chose to be counted as Elven kind, he was then given immortality. Because Arwen is Elrond's daughter and also Half-Elf, she too has the choice to be a mortal woman or an immortal Elf.
The logic is that Arwen chose to be mortal but she was not tied to Aragorn yet cos of the War. So since she had nothing to keep her alive, she was dying. It was maybe the only thing that would've spurred Aragorn to claim his birthright and take the Dimholt road.
Tolkien strongly suggests that it was her marriage to Aragorn that sealed her fate and rendered her mortal. Marriage was hugely significant in Tolkien's works. At that point, she became long-lived but mortal. However, after Aragorn's death, she simply chose when she wanted to die -- as did he.
There are a few candidates. Feanor definitely had the worst legacy. Eol attempted to kill his own son, and instead killed a wife he had entrapped into marrying him. Maeglin actively betrayed his people and sided with Morgoth, though after being tortured.
The average life span of a Moon Elf is seventy, although one can live up to one hundred and twenty years if there is little struggle to live.
According to a legend of the Elves, the first Elves were awakened by Eru Ilúvatar near the bay of Cuiviénen. The first Elf to awake was called Imin ("First"). Next to him lay Iminyë, who would become his wife. Near where Imin woke, awoke Tata ("Second") and Tatië, and Enel ("Third") and Enelyë.
Powers and Abilities
Dark Elves are also immortal, which means they live indefinitely but they can be killed by physical injury.
Elrond Half-elven is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. Both of his parents, Eärendil and Elwing, were half-elven, having both Men and Elves as ancestors.
Once an elf engages in reciprocated love with someone, that's it. If he cannot be with that person he will lose the will to live, die, and become a forever-shade in the Halls of Mandos.
Elves typically have four children or fewer. Fëanor and Nerdanel, who had seven sons, were a notable exception. Whenever the Eldar married, whether in youth or in later life, their children were produced within a relatively short time after their wedding.
Santa advises that no family member touch their Elf on the Shelf, but he does describe a few rare instances when an adult may use tongs or potholders to help an elf in an urgent situation.
Half-elves can have children of their own. When they form families with other half-elves, their offspring will be half-elves themselves. However, if a half-elf has children with someone of different ancestry, even a member of their parental races, the results can vary.
Elrond Half-elven was born in the Havens of Sirion in Beleriand, late in the First Age. His father was Eärendil, a great half-elven mariner who carried a star across the sky at the end of the First Age. Elrond's mother was Elwing, also known as Elwing the White, also half-elven.
And after their marriage, both Aragorn and Arwen are mortal. Arwen, therefore, could not set foot in the Undying Lands without special permission. And she wouldn't be likely to go after it in the end. So unfortunately, she would not go there, unlike Legolas, after Aragorn's passing.
Galadriel has very strong magical powers, and she is said to be the greatest of the Ñoldor after Fëanor. The majority of her powers come from her Ring of Power, Nenya, the Ring of Water.