In Thor: The Dark World, Odin makes it clear that they “are born, they live, they die, just as humans do”, to which Loki replies that “give or take, 5000 years” – so taking that into account, Odin was at least 5000 years old when he died in Ragnarok.

Odin is finally dead in Marvel Comics lore, but he leaves Thor with some surprisingly heartfelt words that no-one saw coming.

Due to his exile by Loki, Odin's power had been slowly draining, so after telling Thor that he loved him, Odin died in a manner fitting a god: his disintegrated into pure energy (the Odinforce) and entered Valhalla.

In Norse mythology, Odin dies during Ragnarok. He fights the giant wolf, Fenrir, and Fenrir kills him. Some modern retellings of the myths claim that Fenrir devours Odin, though others only say he kills him. Odin’s son, Vidar, then kills Fenrir to avenge his father’s death.

In later folklore, Odin sometimes appears as a leader of the Wild Hunt, a ghostly procession of the dead through the winter sky. He is associated with charms and other forms of magic, particularly in Old English and Old Norse texts.