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Well, I was told that you start feeding a kitten adult cat food at 9 months. So I would gather a kitten becomes a cat at 9 months of age :) (not long enough I say)

Cats stop most of their growing at one year, but they are only considered 'fully mature' until they are 7 years, or about 51 years in cat years.

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14y ago

What else can I help you with?