Cat Years to Human Years - Cat Lifespan

What Is My Cat’s Age in Human Years?  

Knowing how your cat’s aging process works as he or she grows through the normal successive stages can help you recognize the changes your pet is experiencing throughout the entire cat lifespan. That will enable you to prepare for the coming stages and make adjustments when/if modifications to the accommodations for your pet become necessary as your cat ages.

Human To Cat Years Conversion Chart

Here’s a convenient chart for quickly finding the conversion of your cat’s current age to the equivalent number of human years of age:

Human Age to Cat Age Conversion Chart

Aging StageHuman AgeCat Age
Birth to 6 months0 to 1 year
2 to 4 years
6 to 8 years
10 years
0 to 1 month
2 to 3 months
4 months
6 months
7 months to 2 years12 years
15 years
21 years
24 years
0 to 1 month
2 to 3 months
4 months
6 months
3 years to 6 years3 years
4 years
5 years
6 years
28 years
32 years
36 years
40 years
7 years to 10 years7 years
8 years
9 years
10 years
44 years
48 years
52 years
56 years
11 years to 14 years11 years
12 years
13 years
14 years
60 years
64 years
68 years
72 years

15 years and older
15 years
16 years
17 years
18 years
76 years
80 years
84 years
88 years

The information in the above chart is from research by the American Animal Hospital Association and the American Association of Feline Practitioners.

How To Convert Cat To Human Years

Cats’ lifespans and rates of maturity are consistent for all breeds of cats. In the simplest terms, to convert cat years to human years, calculate based on these factors:

  • A cat’s 1st year equals 15 years for a human.
  • A cat’s 2nd year equals 9 years for a human.
  • Each year after a cat’s 2nd year equals 4 years for a human.

6 Stages of a Cat’s Life

In their first 2 years of life, cats age at a rate equal to 24 human years. After the 2nd year, for each year of a cat’s life, it ages at the rate of 4 years human years. There are 6 general stages of aging in a cat’s typical lifespan:

Life StageGrowth and Changes
Birth to 6 months
During this first stage of life, a cat undergoes the greatest amount of growth and change.
7 months to 2 years
A cat grows to its full adult size during this stage and begins exhibiting its adult personality traits.
3 years to 6 years
This is the prime of the cat’s life when it is at its most energetic and physically active stage.
7 years to 10 years
A mature cat is of an age equal to adult humans in their 50s. The cat may slow down and exhibit slight aging signs.
11 years to 14 years
In this later stage of life, a cat is likely to show signs of aging, such as lower energy, weight loss or gain, yellowing teeth, cloudy eyes, graying fur, and possibly confusion.
15 years and older
Cats over 15 years of age have lived a full life and, depending on their health condition, may live as long as 20 years and in exceptional cases, as long as 25 years.

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