We donât know
Elrondâs exact age because there are two tellings of Elrondâs age. In one telling, he is the younger brother of
Elros. In the other version, Elrond and Elros are twins. We do know that Elros was 58 years old at end of the
First Age. We also know the
Second Age lasted 3441 years, and the
War of the Ring occurred in Third Age 3119.
Frodo first met Elrond in October Third Age 3118.
My preference is that Elrond is younger than Elros by a few years, maybe two, maybe four. Thatâs the older telling and told more often.
Elros was ten when the surviving
Sons of Fëanor attacked their home and slaughtered all their friends and kin; he and Elrond were taken by
Maglor, the second-oldest of
FĂ«anorâs sons (apparently the most level-headed; besides Maglor, only his oldest brother,
Maedhros, survived the attack), who raised them:
Tolkien tells us that Elros and Elrond actually came to love Maglor. Maglor did this in part because although Elwing, mother of Elros and Elrond, was rescued when all the Sons of FĂ«anor attacked her father Dior EluchĂl in
Doriath in a failed attempt to seize the Silmaril his parents
Beren and
LĂșthien took at great risk and personal cost from
Morgothâs crown, Elwingâs twin brothers, ElurĂn and ElurĂ©d, who were young at the time, were left to starve to death in the forest. (You should be aware that there are
many different earlier versions of that part of the story, along with different names and birth orders: Tolkienâs notes were a mess that his son Christopher spent decades sorting out.) Maglor was famed for his singing and harping and â Elrond played harp: we see him with a harp when he and
Galadriel meet Frodo and
Sam on the way to
the Grey Havens at the end of
Lord of the Rings. Elrond then has twin sons, Elladan and Elrohir. Twins run in families,
but twins tend to skip generations: the first generation will have twins, the next wonât, the third will, and so on. No one knows why (and it isnât a hard-and-fast rule), but itâs a real-world thing thatâs been recognized for
ages. So if Elrondâs uncles were twins and Elrond himself had twins, itâs a more likely that he and Elros were not twins.
My next reasoning is that the
Peredhil, the
Half-elven, were given an irrevocable choice to be numbered among
Elves or
Men. Their father
EĂ€rendil wanted to choose mortality, but chose instead to be counted among the Elves so that he would not be parted from their mother, Elwing, who wanted to stay with the Elves. When that choice came to Elros and Elrond at the end of the First Age â remember, they were both in their fifties at this point â Elros chose to be mortal but Elrond chose to be Elven. Gee, what could explain that? If Elros were the older, heâd have known his father a little better and better understood, perhaps, his fatherâs mind on this matter. Elrond as the younger son might have been closer to his mother. Thatâs wild speculation, but
as a generalization it might fit with a ten year old boy and his younger brother (and completely neglect the four or five decades that elapsed between their separation from their parents and the time of their decision).
So you get to choose. In October Third Age 3118 at the
Council of Elrond, Elrond might be 58 + 3441 + 3118 = 6617 years old, or he might be 2 or even 4 years younger. Heâs really old: more than two ages of the world old. Galadriel and
Celeborn are one generation older, which is apparently another whole age of the world. (Theyâre also Elrondâs in-laws: Elrond married their daughter,
CelebrĂan.) And
CĂrdan the Shipwright is even older, in the generation before Galadriel and Celeborn.