system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How do Thor (and others) age? Does their childhood last hundreds of years? Or do they age to adulthood and then slow completely?
gpt
It's hard to say. Thor is currently 1,500 years old, and Asgardians have a lifespan of around 5,000 years. If Thor's lifespan is proportional to a human's, he would be in his early 20's, close to Chris Hemsworth's age when he was cast in the original movie.

If that's the case, Thor would have reached adulthood at around 1,000 years old.

*But* if we assume Thor was an adult by the beginning of the Viking age, he would have 200-300 years to reach adulthood.

Interestingly, Thor in the MCU is actually several hundred years younger than our first historical records referencing him.