Hanzo and Bill

How could Bill have been one of Hanzo's students if they appear to be about the same age?

Maybe hanzo is 65-70 years old he just looks young?! 😱

there are a lot of things like that don't really make sense in Kill bill. Like O Wren Ishii, who is half chinese, half japanese, and half american.. 😕 since when did one thing have THREE halves?

Its very possible that Bill just learned later. Are you saying you couldn't be taught something by somebody your own age?

Who's to say that they were even student and teacher? Maybe they were rivals.