system
Given the following post, respond as if you're commenting on Reddit:
human
[Kung Fu Panda] Oogway and Kai are about the same age. So why does Oogway talk like a stereotypical old wise sage, while Kai talks like he’s from modern times?

And Kai was imprisoned for like 500 years, so if anything his speech should be *more* antiquated.
gpt
Kai was imprisoned for 500 years. In that entire time, while he may have learned new techniques, he did not grow as a person at all. He never progressed beyond the bandit he originally was. A common misconception is that the farther back you go in history, the more formal  speech becomes, but that's just straight up untrue. It's the case for nobility, but the lower on the social ladder you go, and especially at the bottom where it's outlaws and bandits, the more crude and unrefined language becomes. In several cases, things that were considered slang, or rude, or informal become normal parts of the language later down the line. 

So, to an extent, it makes *more* sense that kai talks like a modern person than if he didn't.

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Oogway, on the other hand, has taken on the role of mentor and "wise man" for some time now, so he adapted his speech to fill that role. He also breaks from this speech pattern into a much more informal one several times, implying that his *natural* speech is still what it once was when he and Kai were close.