She was often called Arwen Undómiel or "Evenstar". In marrying
Arwen reciprocated Aragorn's love, and on the mound of Cerin Amroth they committed themselves to marrying each other. 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.
Arwen was 2,690 years older than Aragorn, so she was unquestionably an Elf until the change. 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.
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.
No, she chose to be mortal and shares the Gift of Men. She would depart from this world via the Halls of Mandos.
In the year 121 of the Fourth Age, after Aragorn's death, Arwen died of a broken heart at Cerin Amroth in Lórien, and was buried there one year after the death of Aragorn, to whom she had been wedded for 122 years.
Arwen didn't want Aragorn to die, because if he died so would she. She said she wasn't tired of living yet. But instead, Aragorn chose to die and Arwen lived a year longer before dying herself.
However, he does not possess the ability to live forever, and he cannot choose to be mortal or immortal like Arwen, the half-Elf he loves and eventually claims as his wife. Because Aragorn is mortal and Arwen chose to remain in Gondor and become mortal, their son, Eldarion, is mortal as well, despite his Elven lineage.
She has a vision of a child clothed in white running across her path. She watches as the boy runs with his arms outstretched to his father, an aged Aragorn, who picks him up with joy and kisses him. As the boy looks at her and she sees he is wearing the Evenstar, she knows the boy to be her child.
Because she has both Elven and Human blood she has a choice. She dies eventually after mourning Aragorn for a long time. She leaves Minas Tirith and lives alone in fading Lothlorien for a while before dying. This is all detailed at the end of RotK, in the appendices.
At this point Arwen has already given up her immortality, but now she grants the grace of the Eldar to Frodo, not giving him immortality since he is not one of the elves, but instead granting him a home in the undying lands when he does pass.
Princess Arwen Evenstar gave her beautiful necklace to Aragon to pledge her eternal love to him. This special gift from an immortal elf to a mortal man symbolized Arwen's decision to forsake her immortality to be with the person she truly loves.
Why was Arwen's fate tied to the ring? Because Aragorn's fate was tied to the Ring. Aragorn, remember, was not going to be King of Arnor and Gondor UNLESS Sauron was defeated. Sauron could not be defeated by any other means than destroying the Ring.
Legolas is an elf, so he is immortal. However, he is only immortal in the sense that he will never die of old age or sickness. He can die in battle.
They are both elvish nobles, as Legolas is the son of King Thranduil and Arwen is the daughter of Elrond. They are both well-educated and would have known each other as the community of elves is quite small.
Legolas does not marry or have any children, based on the appendix of The Lord of the Rings. Regardless of who his mother was, Legolas is the last of his line. When he sails into the West at the beginning of the Fourth Age, he leaves no family members behind.
Originally, Tolkien intended for Éowyn to marry Aragorn. Later, however, he decided against it because Aragorn was "too old and lordly and grim". He considered making Éowyn the twin sister of Éomund, and having her die "to avenge or save Théoden".
Galadriel is Arwen's grandmother. Arwen's father, Lord Elrond of Rivendell/Imladris, marries Galadriel's daughter, Celebrían. This means that both Galadriel and Celeborn are Arwen's grandparents, in addition to the more commonly known Elwing and Ëarendil.
When they meet, Arwen is thousands of years old with immortal beauty and he a young 20-something man. However, next time they meet, Aragorn is in his 50s. This was when Arwen fell in love with him, so his 30 years of maturing must have done some good.
In Middle-earth, half-elves are the children of Elves and Men, and can choose either Elvish immortality or the mortal life of Men.
So by Aragorn living 210 years, he was given a lifespan of a king who lived at a time when the Dúnedain were still strong. The Chieftains previous to Aragorn had been living into their 150s, except for those who had died an untimely death (usually in battle).
After he was attacked by the orcs, they transported his lifeless body to Mordor at Sauron's behest. Sauron revived Isildur with one of the nine rings, and then tortured him until his spirit was broken and he became a Nazgûl.
Average Elven Lifespan
Elves have the ability to live forever thanks to their immortality. Elves like Elrond, who was over 6000 years old in The Lord of the Rings, are not hard to come by.
Legolas Was 2,931 Years Old (in the Films)
Tolkien actually never specified an age for the bow-toting Silvan Elf.
the Evenstar, a jewel which Arwen gives to her love Aragorn; invented for The Lord of the Rings film series directed by Peter Jackson.