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First year: This is like a whirlwind growth period for kittens. One year for your cat is equivalent to about 15 human years.
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Second year: This is another big year of growth. Add another 9 human years to your cat's age.
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After two years: For each year after that, add 4 human years to your cat's age.
For example, if your cat is 3 years old, you would calculate their age like this:
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15 years (for the first year)
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9 years (for the second year)
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4 years (for the third year)
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= 28 human years
So, according to this method, a 3-year-old cat is roughly equivalent to a 28-year-old human