Cat years

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The life expectancy of a cat is typically 12–15 years. However, some cats that are kept indoors may attain the age of 21 years or more.[1] By comparison, the average life expectancy of humans at birth is 67.2 years.[2] A one-year-old cat is roughly comparable, in developmental terms, to a 15-year-old-human. Subsequent years of a cat's life add progressively fewer years to its human age equivalent, so that a 15-year old cat is roughly comparable, developmentally, to a 76-year-old human.[3]

The table below shows the correspondence between a cat's chronological age and the age of a human at a comparable stage of development.

Calendar years Equivalent human age
1 15
2 24
3 28
4 32
5 36
6 40
7 44
8 48
9 52
10 56
11 60
12 64
13 68
14 72
15 76
16 80
17 84
18 88
19 92
20 96
21 100

The oldest cat ever recorded was Creme Puff, who died in 2005, having attained the age of 38 years, 3 days (equivalent to the human age of 168 years).

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