6 Ways To Tell Your Cat’s Age

So you’ve decided to take in a kitty of your own. Congrats! But did you know that if you’re adopting a cat from a shelter—or even an outdoor cat who’s a stray off the street—knowing how old they are is important to their health?

That’s right. It’s important for many reasons besides just curiosity, such as knowing what type of cat food to feed them, what medical issues to look out for, and more. So how can you tell a cat’s age?

Sure, you can make an educated guess based on your new feline friend’s energy level or appearance, but these qualities are not always indicative of age. Going to a cat expert—like a veterinarian or a trainer—can help you solve the mystery with greater accuracy.

In the meantime, we’re here to help! Let’s take a look at some signs that can clue us in on a cat’s age.

Keep in mind, though, that no matter how detailed of an analysis you or your veterinarian do to narrow down your cat’s age to a general period of years, there’s no way to tell the exact age of a cat without knowing when they were born.

The first clue? Your cat’s teeth. You can guesstimate a cat’s age (whether they’re a young cat, middle-aged or senior) based on their teeth, says Dr. Amber Carter, DVM, DABVP (Feline Practice) at the Cat Care Clinic in Ormond Beach, Florida. If your cat still has their baby teeth rather than their adult teeth, of course, it means you’re dealing with a kitten—but you probably knew that already. On the other hand, if a cat has significant tartar buildup, dental calculus or periodontal disease, chances are that they are older, she explains.

Adult cats with little to no dental issues are often younger—but that’s not always the case, she cautions. “After a cat gets over about 2 years old, [judging by the teeth alone] can be difficult,” she explains. That’s because some cats are just naturally resistant to dental issues, with pristine pearly whites well into adulthood.

How to assess your cat’s age at home: This may sound strange, but get up close and smell their breath—don’t be shy! “Dental disease often goes unnoticed until significant dental care needs to be performed,” says Carter. “If your cat will let you, lift [their] lip and take a look. Do you see any redness, inflammation, or anything less than pearly whites?” If so, your cat may be older—and also, it’s time to take them to the vet for a dental cleaning. Now’s a great time to start a tooth brushing routine with them too!

A cat’s coat may look different based on their age for two reasons. First, cats’ fur sometimes turns coarse as they age, Carter says. Secondly, senior cats often have trouble grooming well, which can lead to matting and a generally disheveled appearance.

But just like with their teeth, you can’t judge a cat on their coat alone.”Older cats do not groom as well and may have matting, especially along their back,” Carter says. “However, a young stray off the street could be very unkempt, too!”

How to assess your cat’s age at home: There’s no specific age when a cat’s coat goes coarse, but if your cat feels less soft than the typical feline, you can guess that they’re at least six months old. That’s when a cat goes through puberty and develops their adult coat, which can be coarser than their kitten fur.

If you notice that your cat is having trouble grooming, that could indicate that they’re a senior—and that you should consult your veterinarian for tips to help them stay clean and comfortable.

Cats’ eyes develop aging changes to the lens as they get older. While cataracts are not very common in cats, there are a few signs that show a cat’s age range in its eyes. “If you see a grayness or dullness to the lens, that is called lenticular sclerosis or nuclear sclerosis,” says Carter, which indicates an older animal.

How to assess your cat’s age at home: Look for grayness or dullness—a cloudiness—in their eyes. If you see it, your cat is likely an older adult or senior.

A cat at any age can be well muscled, but if a cat has significant muscle wasting over their spine or rear legs—aka a skinny, sunken-in appearance—they are likely a senior.

How to assess your cat’s age at home: Look for that sunken-in appearance—and if you notice it, keep an eye on their drinking and litter box habits, too. “If they drink or urinate a noticeable amount,” says Carter, “they may have underlying kidney disease or other conditions that need to be addressed.”

The length of your cat’s life, and therefore how quickly they age, may be affected by their breed. In general, purebreds tend to not always live as long as their non-purebred counterparts. “This is due to less diversity in their genetic pool and predisposition to certain illnesses and medical conditions,” says Dr. Linda Simon, MVB, MRCVS, a veterinarian in London, England. But take that information with a grain of salt. There are many purebred cats who live well into their late teens and even to age 20. But overall, mixed-breed cats are more likely to live longer.

How to assess your cat’s age at home: Because purebred cats generally have shorter lives, they’re more likely to age more rapidly than mixed breeds. So, if your purebred cat is showing signs of aging, they may be a year or two younger than you’d typically expect. However, a cat’s breed isn’t the only factor that can contribute to rapid aging. “Very anxious cats and those prone to stress will also age quicker due to the effects of cortisol on their body,” Simon says.

Cats of any age can generally be trained as long as they have reasonable cognitive function—but whether they actually want to train may be a different story. Younger cats might be up for just about anything, while older cats have more reasons to ignore your requests.

“[Training] needs to fall in line with the individual cat’s physical limitations, energy level, etc., regardless of age,” says LeeAnna Buis, CFTBS, a certified feline training and behavior consultant at Feline Behavior Solutions in Seattle, Washington. “[Older cats] may need more repetition to solidify a new behavior, or you may have to work in smaller steps.”

How to assess your cat’s age at home: What is your new cat’s activity level? Do they have a constant need for play, or are they constantly asleep? In general, “the younger a cat, the more amenable they are to training and the less fearful of change,” says Simon. “A poorly socialized middle-aged cat who has never been trained will find it very difficult to accept the training and to adapt to new situations.”

“If my cat were a person, how old would they be?” That’s a complex question. Generally, cats age quickly in the first two years of life, so a 2-year-old cat is comparable to a young adult human at age 24. After that, you can add four human years for each cat year. But factors like physical and mental development and breed affect your cat’s true age as it relates to humans. Find out how to calculate your cat’s age in human years.