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Note: This calculator uses a method developed by Monsieur LeBeau which is more accurate than linear estimates. For example, seven cat years is equal to one human year. After one year your cat or kitten will have the age of a fifteen year old person. At two years, the pet will have an equivalent age of twenty four. For the years between two and fourteen, the cat will age at a rate of four human years. After fourteen, the feline will age at a rate of two human years.