In the MCU, it is confirmed that Loki was 1,054 years old when he was killed by Thanos in Avengers: Infinity War.
Asgardians live for about 5,000 years and Loki's only been around for 1,070 of those years, which, relative to humans, makes him about 21.4 years old. Thor, on the other hand, is 1,500 years old, which makes him about 30 years old in human years.
Thor and Loki's ages relative to human years were worked out with Thor 23 years old and Loki just 16 years old!
In the Marvel Cinematic Universe, Thor is older than Loki. Thor is 1500 years old, whereas Loki is much younger at 1048 years Old. Meaning Thor is actually 452 years older than Loki. We know Thor Odinson's exact age because he tells Rocket in Avengers: Infinity War.
In Thor 2 the life expectancy was stated to be around 5,000. The average human life in developed countries from what I've gathered is approximately 82. Therefore, in human years Loki is somewhere around 17.
"Many people don't know this, but Kid Loki is the oldest one in The Void. He was pruned thousands of years before and just didn't age because of The Void being the end of time as said by Judge Renslayer.
Give or take 5000 years." From this, it can be taken that Asgardians live approximately 5000 years longer than humans.
Asgardians' regenerative abilities enable them to have longer lifespans. While humans generally perceive them as immortal, Odin has pointed out they are not. Loki noted that, even though they are not truly immortal, Asgardians live much longer, "give or take 5,000 years".
Thanos was born approximately 1,000 years ago on the planet Titan to A'Lars, along with his brother Eros.
Hela Odinsdottir was the ruler of Hel, the daughter of Odin Borson, the older half-sister of Thor Odinson, and the adoptive older sister of Loki Laufeyson.
While Thor is powerful and his strength is said to be unmatched, he is not strictly immortal like other mythological gods. He is susceptible both to aging and to being killed in battle. Like other Norse gods, he must consume special apples kept by the goddess Idun to keep from aging.
In Avengers: Infinity War, when Loki was killed by Thanos, he was 1,054 years old.
Plus, Kid Loki has been in the Void long enough to establish himself as the king. In Ragnarok, Thor says the snake incident happened when they were eight years old. Kid Loki could've been growing up in the Void since then.
Superhuman Strength: Loki, without the aid of anything, through his own biology, possesses superhuman strength that is substantially superior to that of an average Asgardian male. He possesses sufficient physical strength to lift up to 50 tons.
Before the opening title even appeared, several well-known characters met their demise, including Loki. While behind the scenes of the shoot was more lighthearted, on-screen fans were heartbroken. Thanos kills Loki brutally and tragically while Thor helplessly watches.
Loki is married to Sigyn and they have two sons, Narfi or Nari and Váli. By the jötunn Angrboða, Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr.
Meanwhile, Groot was around four years old during the events of the Avengers: Infinity War and Endgame. Then, in The Holiday Special and Vol. 3, he is around five to six years old. If you count the time he was snapped as lifespan, in that case, he is around 11 years old in Guardians of the Galaxy Vol.
Thanos' beloved, the hooded embodiment of the end, should make an appearance before the Thanos saga is over. Something about that cloaked figure and her skull visage standing next to Thanos is so iconic. Death's inclusion would make audiences understand (and fear) Thanos as he tries to burn a galaxy to win her love."
Thor. Thor is the oldest official Avenger at about 1,505 years of age. He mentions his age for the first time during Avengers: Infinity War, which would put his birth date around 518 CE. However, some sources say that Thor's birth date is around 965 CE, but this might be information from the comics.
Superhuman Longevity: Thor has a lifespan far longer than that of a human being. While not truly immortal, he is known to be around 1500 years old, having said so to Rocket.
How Long Thor Is Expected To Live As An Asgardian. The lifespan of a typical Asgardian is said to be approximately 5,000-years-old in the MCU. Based on Thor's age, he's basically in his thirties in human years, proving that he still has a lot of life ahead of him.
Thor is Immortal, Not Invincible
Thor is more or less immortal, granted the gift of everlasting life, thanks to his Asgardian genes and his special diet of the Apples of Idunn.
Ymir became the father of all the giants, and his cow Auðumbla licked out of the ice the first Asgardian, Buri.
Superhuman Stamina: His stamina is almost limitless. Thor survives the Time Stone of time. While still aging physically, he retains his youthful appearance far longer than humans, barely changed after Thanos used the Time Stone to age by several centuries, and will only grow stronger the older he gets.