How many years old were you when you realized anime characters weren't based off humans?

I always assumed anime characters were Asians, maybe my brain is just racist but I legit did, did you know anime characters facial appearance and specific features were actually made based to resemble cats? They use cats faces to make humans that would make them look more cute or adorable, like that's the reason why their noses look like that and why their eyes are so big, let that sink in.
How many years old were you when you realized anime characters weren't based off humans?
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