In many places Loki is described as Thor's youngest brother. However, in Thor:Ragnarok, Thor is talking about an incident from their childhood

This one time when we were children he transformed himself into a snake and he knows I love snakes so I went to pick up the snake to admire it and he transformed back into himself and was like “YARGH IT’S ME!” and then he stabbed me. We were eight at the time.

So if they were both eight, then they should be the same age.

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    One is younger than another if they are born minutes later. They could also have been born 11 months apart and still both be 8. – Edlothiad Nov 28 '17 at 9:30
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    movies.stackexchange.com/questions/82458/… Age already answered here, And as Edlothiad said, he can be yunger than Thor by mare minutes or 11 moths and still be same age. – Vanja Vasiljevic Nov 28 '17 at 12:08
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    I like the sheer amount of ignorance shown in that Wikipedia page. Basically it says: Thor has lived for thousands years, he is about a thousand years old and he practiced his skill for many millenia (which again means many thousand years) – motoDrizzt Nov 28 '17 at 12:14
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    Yeah Wiki is know for doing that. Anyway another thought crossed my mind. We use Earth years to count how old Thor and Loki are. Is Ashard year and Earth years same length? I mean if Asgard year is longer than ours there can be 10 Earth years apart and still be in same age by Asgard standards. I have to look into that and maybe post a question – Vanja Vasiljevic Nov 28 '17 at 12:22
  • Remember, Loki is adopted... – Odin1806 Nov 29 '17 at 1:20

It's explicitly stated in Thor that Thor is the elder son.

ODIN: Gungnir. Its aim is true, its power strong. With it I have defended Asgard and the lives of the innocent across the Nine Realms since the time of the Great Beginning. And though the day has come for a new King to wield his own weapon -- that duty remains the same. Thor Odinson, my heir, my first-born.

Given that Loki is adopted, it's very possible that he's actually the elder of the pair, but he's never acknowledged as such, even after the truth comes out.

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    But first-born is a reference to the first child that was actually his. I have a son but if I now adopt an older child, my son will still be my first-born son, even if he is now younger than his brother. – KennyPeanuts Dec 1 '17 at 14:05
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    @KennyPeanuts - Except that at this point it was a secret that Loki was adopted. – Valorum Dec 1 '17 at 15:44

It is a plot point in Thor: Ragnarok that Hela is the true first born of Odin and therefore has a claim to the throne of Asgard. Thus we can conclude that the throne of Asgard is determined by primogeniture (goes to the first born). Therefore, since Loki didn't make a claim on that basis (adopted or not) we can take this as evidence that Thor is older.

(Counterpoints could be that he is not natural born, or that he was adopted after Thor's birth and was therefore not actually "the first child", however since there was never any dialog justifying Thor's claim along these line, I think it's safe to say it's probably just that Thor is older.)


According to the captions from Thor 1, the Jotun vs. Asgardian battle took place in 965 AD. That's when we see infant Jotun!Loki. In Avengers: Infinity War, Thor said he was 1500 years old (ref: https://movieweb.com/thor-age-avengers-infinity-war/). If Loki isn't even 1100, then Thor is definitely physically older. I think I read somewhere that the "snake story" scene in Thor: Ragnarok was improvised, but I couldn't quickly find a confirming source--either way, that movie relied pretty heavily on "Americanized" humor and though it's a stretch, you could almost justify that Thor was just throwing out a random young age off the top of his head to give Bruce an idea as to about how old they were in human years.


Well since Odin found Loki he can't know for sure when he was born so he could lie to Loki about his birthday and make Thor the first born by that :/

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    So basically what I said in the answer above? – Valorum Mar 23 '18 at 21:27

I'm afraid none of what I'm about to say is a total legit answer, more or less a set of hypotheses.

Technically Thor could still be the older brother. I don't mean in like a "I'm a few seconds older" way but more like if Thor were born in January and Loki in October, Making Thor the older brother by a few months. Also Loki is a Frost Giant and ages might be weird for Frost Giants. It's also possible Thor is considered 'older' because he is Odin's legitimate child and as such is more in line for the throne than Loki, because again Loki is adopted.

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