Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Do Cats Age Like Dogs? What Science Tells Us

Cat and dog together on sofa indoors

Both cats and dogs age faster than humans. When a cat or dog has only been alive for a few years, they are considered adults. By the time they reach their teens, they are usually considered elderly. However, cats do not age as dogs do. This is because of the high variability in dog sizes that we can find. Cats tend to live longer than most large and giant dogs because the larger the dog is, the quicker they will age.1

So, do cats age differently than dogs? What things play a role in how your cat ages? Should we be trying to figure out how old our cats would be in “human ages” as time passes? Cats’ aging rate is slower when compared to large and giant dog breeds, and they typically live much longer. What’s remarkable is that, for their small size, cats live quite a long time. Generally speaking, some smaller animals tend to live shorter lives than larger ones. These are all great questions that deserve thorough answers, so we put together a little gfocusingcuses on these topics and more.

divider 3 paws

Cats Age Differently Than Dogs

Cats and dogs do age at different rates, which is why cats tend to live longer than dogs. A dog’s genetic makeup plays a role in how long they live, just like a cat does. Since the genetic madifferserent between cats and dogs, you can expect the two species to age slightly differently. Dogs tend to grow faster and larger than cats, which means that their bodily processes work faster.

So, in the end, a dog can live for anywhere from 8 to 14 years (sometimes shorter or longer, depending on their breed, size, lifestyle, and medical history), while a cat can live up to 15 to 18 years of age. Some cats have even been known to see their 20th birthdays. Cats that live indoors tend to have longer lifespans than cats that live outdoors, where accidents and illnesses are much more of a threat.

tuxedo cat sitting on cemented ground
Image Credit: Yannick McCabe-Costa, Pixabay

Calculating a Cat’s Age in Human Terms

Calculating a cat’s age requires that you know at least the year in which the cat was born. Otherwise, you can work with a veterinarian to try to determine how old the cat is. If you do know the cat’s birthday, you should be able to gain a good idea of their age in terms of human years.

There are tables created by experts to show the correlation between cats’ life stages and the equivalent human age. When a cat reaches the age of 2, it is thought that they are about 24 human years old. After the age of 2, a year of cat life is equal to 4 years of human life. Therefore, by the time that your cat is 5 years old, they would be the equivalent age of a human who is 36 years old. Cats that live into their teens are the equivalent age of humans who are in their 70s!

soft-furry-tabby-cat-lying-on-its-owners-lap
Image Credit: Debra Anderson, Shutterstock

Signs of Aging in Cats

Understanding how old your cat is does not tell a complete picture of how old their bodies are or how old they might live to be. Cats do not show signs of aging the same way that dogs do, but they can display behaviors and physical changes that could mean your cat is getting older.

Some cats start to lose weight and muscle mass once they reach their senior years. This loss can be tough for owners to spot because they see their cats every day, and the changes are subtle and happen over weeks if not months.

Behavioral changes are also usually displayed when a cat gets older and starts to wind down from a life of fun and excitement. An older cat may be less excited when you walk in the door at the end of a long day. They might walk slower, stiffer, or be reluctant to jump up and down as before. They might seem more cautious when people come to their homes for a visit. They will probably be less curious and playful, too.

divider 2 cats

In Conclusion

Cats and dogs age differently due to genetic and bodily differences. Cats usually live longer than dogs and can reach the ripe old age of 20, which is impressive. Having regular health checks with your vet, being vigilant for signs of disease, vaccinating and protecting your dog against parasites, having a good diet, exercising regularly, and staying away from danger can all impact the lifespan of a cat. Cats that live outdoors are more susceptible to illness and accidents, so unfortunately, they don’t typically live as long as cats living strictly indoors.


Featured Image Credit: New Africa, Shutterstock

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

10 Best Cat Trees Under $100 in 2025 – Reviews & Top Picks

Cats love and need to climb and scratch. It’s in their nature. A cat tree provides an easy and fun way for them...

How to Find a New Vet: 9 Steps to Follow (Vet-Approved)

Choosing a new veterinarian for your beloved furry friend is a crucial decision that can significantly impact their health and happiness. Whether you’ve...

How to Keep Cats Out of Your Yard & Garden: 9 Vet-Approved Methods

While all cats are adorable, fun, and frisky, they can also be destructive, and strays can sometimes carry diseases. If you have a...

Are Burmese Cats Hypoallergenic? What You Need To Know!

Since they’re affectionate, playful, and fiercely loyal, the Burmese cat is very easy to love. If you’re an allergy sufferer but would love...

More related

How to Protect Bird Nests From Cats: 12 Effective Vet-Verified Ideas

Be they feral cats, loose strays, or wandering outdoor pets, cats kill millions of wild birds each year 1. While the felines aren’t...

Can Cats Be Gay, Bisexual, or Lesbian? Vet Reviewed Feline Sexuality Facts

Some of the behaviors our pets exhibit mimic our own, but many of their quirks seem strange. It’s difficult to interpret a feline’s...

Gum Disease in Cats: Our Vet Explains Causes, Signs & Treatments

No one enjoys being woken up in the morning by a kitty crying for breakfast and attention, but the routine is even less...

Scottish Fold British Shorthair Cat Mix: Info, Pictures, Temperament & Traits

The Scottish Fold is instantly recognizable due to their folded-over ears and thick, short fur. The British Shorthair has characteristically large round eyes...

Keep reading

Treating Ear Mites in Cats: Vet-Approved Tips & Tricks

Cats have incredible ears! Their hearing range is over 10 octaves, more than dogs or humans, and they have 32 muscles in each ear to help them pinpoint sounds exactly. But that doesn’t make them immune to parasites. If your...

white orange cat with ear mites

What Are Normal Vital Signs for Cats? Vet-Approved Tips & FAQ

A cat’s vital signs can help determine how the feline is doing, as well as point out any potential problems. For instance, if a cat’s heart rate is too fast or too slow, it may indicate an underlying issue. Of...

scottish fold cat checked by vet

Vetster Online Vet Appointments Review 2025: Our Expert’s Opinion

Telemedicine has become increasingly popular in the human healthcare world, and with good reason. By allowing you to speak to a doctor virtually, telemedicine appointments make getting care more convenient, accessible, and affordable. Telemedicine has the power to do the...

CAT_SAPR_Vetster Online Vet

Why Do Cats Stare at Nothing? 4 Possible Reasons

Experienced cat owners know that no matter how much we bond with and learn about our pets, there will always be at least a few behaviors that leave us scratching our heads. Cats have all kinds of quirks ranging from...

Tuxedo cat sitting on the bed

Safe & Effective Cat Shampoo Alternatives: 8 Vet Approved Options

Most cats are good at keeping themselves clean, but sometimes, your furry friend might need a little help, especially if they’ve investigated something filthy. Of course, a shampoo specifically designed for cats is the best and safest option. Sometimes, we...

Woman washing cat in grooming salon

Can Cats Eat Apple Pie? Vet Reviewed Advice

Apple pie is a popular dessert, and the smell alone will attract any hungry and curious pet. If you catch your cat sniffing around the pie dish, you may be tempted to share a slice, or if your cat has...

Can Cats Eat Apple Pie

Can Cats Eat Anchovies? Vet-Reviewed Facts & FAQ

Cats love meaty treats, and anchovies are no different. In fact, anchovies are a moderately healthy food that many cats love. They make a great natural alternative to commercially available cat treats and giving your cat a few anchovies along...

Can Cats Eat Anchovies

Caterwauling: What Is It & Why Do Cats Do It? 5 Vet-Reviewed Reasons for This Behavior

Most people are pretty familiar with a cat’s average meow. However, a cat’s high-pitched yowl is significantly different. This yowl is usually referred to as caterwauling. While meows can occur for all sorts of reasons, caterwauling usually has a particular...

Caterwauling