One cat year does not equal seven human years. Read on for tips on determining your cat’s age.

A popular misconception is that cats age seven years (in human years) for each calendar year. In fact, feline aging is much more rapid during the first two years of life. A cat reaches the approximate human age of 15 during his first year, then 24 at age 2. Each year thereafter, a cat ages approximately four cat years for every calendar year. Thus, a cat who is 5 in cat years would be approximately 36 in human years.

**Note:** It should be remembered that a cat who lives outdoors ages far more quickly, perhaps even twice as fast, than an indoor cat. Scroll to the bottom of this article to find out more about cat to human years for outdoor cats.

If you’ve taken in a stray cat or adopted a cat whose age is unknown, there are some ways to determine her age in cat years. Here are some things vets check to get a general sense of how old a cat is:

**A Cat’s Teeth:**Teeth are a great indicator of a cat’s age in cat years. Older cats tend to have more staining than younger cats, assuming the previous owner was negligent in brushing the cat’s teeth. And a kitten’s teeth first come in between two to four weeks; their more permanent set appears at around four months of age. So if you open a cat’s mouth and find permanent, white teeth, the feline is likely to be around a year old. Some yellowing might place the cat between 1 and 2, and tartar build-up on all the teeth indicates that the cat could be between 3 and 5. Missing teeth may mean you have a senior cat on your hands.**A Cat’s Muscle Tone:**Younger cats are more likely to have some muscle definition from their higher activity level. Older cats are usually a bit bonier and may have some extra skin hanging or protruding shoulder blades.**A Cat’s Coat:**The condition of a cat’s coat is another great indicator of a kitty’s age in cat years. Kittens and younger cats usually have soft, fine coats, whereas older cats tends to have thicker, coarser fur. A senior cat may display grays or patches of white.**A Cat’s Eyes:**Bright, clear eyes without tearing or eye discharge are common in younger cats. A cat with some cloudiness in their eyes is likely to be 12 years old or so. While inspecting the lens, also examine the iris of the eye. Young cats have smooth irises, while the iris of an old cat can sometimes appear somewhat jagged.

Felines are generally quite long-lived, though mileage varies depending on owner maintenance and genetic predisposition. In a handful of documented cases, cats have exceeded 30 years in age. Typically, indoor cats may live 12 to 18 years, with many surviving into their 20s.

Outdoor cats can have a significantly shorter life span then indoor-only cats, often living only two to five years. Pet parents in urban and suburban areas are strongly encouraged to keep their cats indoors.

**Tell us:** How old is your cat in cat years? How old is your cat in human years?

*Top Photo: © GrapeImages | E+ / Getty Images Plus.
*

*This piece was originally published in 2017. *

## 172 comments on “How to Calculate Cat Years to Human Years”

## Comment navigation

My cat is indoor/outdoor. She turned 13 last month. She has a cat door but lately spends most of her time indoors. Mornings and evenings she goes outside. She catches chipmunks when they’re in season, brings them inside for her dog to kill, and then eats her favorite parts.

I have three indoor cats. The eldest is male 17 years, he still plays like a kitten, but sleeps more than he used to. He also does not see as well out of his left eye, other than that, he is in good health. Our next is a 9 years old male. Our female just turned 2 years of age. They all are tuxedo breed. My husband and I have always believed, life is better with a cat.

My cat is 21 human years old…still looks like a kitten missing only one bottom “fang” and can still jump through a 4 1\2 foot high window. My question is how old is she in cat years?

About 2 years old

I had 3 cats who were related and each lived to be 22 years old. I now have a cat who will be 16.5 years old on July 4, 2020. I always show only love to my cats and allow them to live life on their terns.

I have had a stray cat ???? for 5 years.

She is going grey around her mouth.

Don’t know how old she is or was when I got her.

I am 43, how old am I in cat years?

So my beautiful male domestic breed just celebrated his 18th birthday April 17.

My oldest cat just turned 16 on April 24, 2020, or 80 in cat years! ????

The middle one will be 14 in September, or 72 in cat years!????

The youngest will be 12 also in September, or 64 in cat years!????

Those aren’t supposed to be question marks, I posted heart emojis & apparently that’s how it came out LOL oops! ;)

My cat is one years old how old is that in human years please

Your cat would be 12 years old in cat years.

I didn’t find a link to the chart…?

My stray is approximately 3years old. Because of her being abandoned she lost 12 teeth and her hearing from a severe infection. How old is she?

I’ve always thought that the seven-to-one age ratio was for dogs. I’ve never heard of it for cats. (It’s not true for dogs, either.) The second year of a cat’s age is the equivalent of 24 human years. Every year after that, from Year Three and beyond, is equal to four (4) human years. Therefore, a five-year-old cat is equal, agewise, to a 39-year-old human (24+15). A 12-year-old cat is equal to a 64-year-old human, etc.

Amazing how many people can’t manage to do the math! The formula is in the article.

My cat just turned 10 how old is he in hiumab years as he has cancer and there’s nothing we can do now as it’s metasitsized

Cannabis Oil will make your cat live awhile longer and in less pain you should try it.

My cat is four in human years, how old is she in cat years? I’ve beed curious for some time now.

32

32

My cat is 8 how old in cat years?

your cat is dead now MWAHAHAHAHHAHAHAHAHAAHHAAHHAHAHAHA

My cat is almost 11. How old is she in cat years?

Your cat would be 48 years old in cat years.

Your cat would be 64

My sister’s cat is around 17 years old. How old is she in human years?

Around 84 years old!

## Comment navigation