How Fast Do Cats Age Compared to Humans?

by Alex Kountry
Updated on

A common question we are asked is “How fast do cats age compared to humans?” Let’s take a look at the science behind this question.

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One of the most common questions asked by cat owners is “how fast do cats age compared to humans?” The short answer is that cats age much faster than humans do. A one-year-old cat is roughly the equivalent of a 16-year-old human, and a two-year-old cat is like a 24-year-old human.

Of course, this isn’t a perfect comparison, since individual cats age at different rates depending on their breed, health, and lifestyle. But in general, cats reach adulthood much sooner than humans do and they age more quickly as they get older.

There are a few theories as to why this is the case. One possibility is that cats evolved to age quickly so that they could reproduce quickly and have more offspring. Another theory is that since cats live shorter lives than humans, their bodies don’t need to last as long and so they age more quickly.

Whatever the reason, it’s important to keep in mind that your cat will not have the same lifespan as you do. Cats typically live for around 12-18 years, while humans can live for 60 years or more. So while your cat may seem like a youngster when they’re 10 years old, they are actually entering their senior years and may need special care and attention from you at this stage in their life.

How fast do cats age compared to humans?

Cats age faster than humans for a number of reasons. One reason is that they have a shorter life span. The average lifespan of a cat is about 15 years, while the average lifespan of a human is about 79 years. This means that a cat will age about 5 years for every 1 year that a human ages.

The first year

A cat’s life expectancy is directly related to its size. Smaller cats live longer than larger cats. The average life expectancy of a mixed-breed cat is about 14 years, but this number can be affected by several factors, including diet, lifestyle and genetics.

The first year of a cat’s life is equivalent to approximately 15 human years. By the end of the second year, a cat will have reached the age of 24 in human years. After that, each additional year is equal to approximately four human years. So, a three-year-old cat is roughly the equivalent of a 36-year-old human.

Cats age more slowly than humans in the early years of their lives. For example, a one-year-old cat is roughly the equivalent of a 15-year-old human, while a two-year-old cat is like a 24-year-old human. However, cats age more quickly than humans once they reach adulthood. For example, a six-year-old cat is approximately the equivalent of a 45-year-old human.

The second year

During the second year of a cat’s life, he will age approximately 24 human years. For a rough estimate of your cat’s age in human years, simply add 24 to his age in cat years. So, a two-year-old cat would be roughly equivalent to a 28-year-old human (24+2=26).

Cats generally live longer than dogs, with an average lifespan of around 15 years. However, this can vary depending on the breed of cat. For example,Siamese cats often live for around 20 years, while Sphynx cats typically have a lifespan of around 12 years.

Every year after that

Every year after that, a cat ages approximately four cat years for every human year. So, a one-year-old cat is approximately the same as a 16-year-old human teenager, and a two-year-old cat is like a 24-year-old human adult. After that, it gets a little more complicated, because cats live much longer than humans. A 15-year-old cat is like a 96-year-old human, and a 20-year-old cat is like a 120-year-old human.

Why do cats age faster than humans?

Cats age faster than humans because they have a shorter life span. Cats also have a higher metabolism which causes them to age faster.

A cat’s shorter life expectancy

One of the reasons your cats don’t live as long as you do is because they age faster. A one-year-old cat is roughly the equivalent of a 16-year-old human, and a two-year-old cat is like a 24-year-old human.

There are a few reasons for this. For one thing, cats have a higher metabolism than humans, so they burn through energy (and age) more quickly. They also don’t have the same repair mechanisms that we do. For example, when we humans get a cut, our bodies immediately start working to heal the wound and repair any damage. Cats don’t have this same ability, so they’re more susceptible to infection and disease.

This doesn’t mean that you should love your cats any less – they just need a little extra care and attention to help them live long, healthy lives!

A cat’s faster metabolism

It all has to do with a cat’s metabolism, which is much faster than ours. A kitten’s metabolism is about twice as fast as an adult human’s. It slows down some as they age, but not nearly as much as ours does. So basically, a one-year-old cat is roughly the equivalent of a 16-year-old human in terms of maturity and development.

Another factor that plays into a cat’s accelerated aging process is their shorter life span. A typical housecat lives between 12 and 20 years, while the average human lifespan is closer to 70 years. So when you do the math, it makes sense that cats age faster than we do.

Of course, there are always exceptions to the rule. Some cats live well into their late 20s or early 30s, just like some humans make it to 100 years old or more. It all depends on the individual cat’s genetics and lifestyle.


Based on the information we gathered, it seems that cats age at a rate of around 7 years for every 1 human year. This means that a 1-year-old cat is roughly equivalent to a 7-year-old human, and a 9-year-old cat is roughly equivalent to a 63-year-old human. Of course, individual cats will age at different rates depending on their genetics and lifestyle, but this is a general rule of thumb.

So if you have a feline friend that you’ve been wondering about, now you have a better idea of how old they are in human years!

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About the author

Alex Kountry

Alex Kountry is the founder of HayFarmGuy and has been a backyard farmer for over 10 years. Since then he has decided to write helpful articles that will help you become a better backyard farmer and know what to do. He also loves to play tennis and read books


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