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This sort of law quickly falls into absurdity.
Taking things literally, one could say "You just drew those stick figures - they're really only a few seconds old!"
And what about catgirls? How quickly do they age? 18 in human years is 88 in cat years - do catgirls fall somewhere in between? Maybe we need to commission a study on the life cycle of catgirls.
The lesson? Trying to apply the laws of reality to fiction is futile, and you will almost surely make yourself look foolish in the process.