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"Cat years" is an expression that compares the age of a cat to the age of a human. Because each is a different size and has a different lifespan, we use the approximate ratio of elapsed time to expected time. Say that a cat lives for 10 years and a human lives for 70. When the cat reaches age 6, it is at the equivalent point in its life to a person aged 42. So in 'cat years' the cat is aged 42, while in real time it is only 6. The same idea can be applied to other animals, dogs being the main one.

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16y ago

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