CAT CARE

Signs of Aging in Cats Owners Often Miss

Last updated: September 21, 2026 · Written by Sam, Founder

Senior cat resting, showing early signs of aging

Arthritis affects most cats over 12, yet signs are subtle: less grooming, fewer jumps, night yowling, litter box changes. What to watch and when to act.

Short answer: Cats hide discomfort well, so aging usually shows up as quiet changes rather than anything dramatic. Look for less grooming, fewer or lower jumps, more sleep, night-time yowling, drinking more, weight loss and small litter box changes. These changes are common: in one X-ray study, 90% of cats over 12 had degenerative joint disease. The 2021 AAHA/AAFP Feline Life Stage Guidelines recommend twice-yearly checkups once a cat is over 10.

Cats are experts at hiding discomfort, so aging often shows up as small changes that are easy to explain away. Many of them can appear years before a cat seems obviously “old.”

When Does a Cat Start Aging?

Under the AAHA/AAFP guidelines, cats are mature adults from 7 to 10 and seniors after 10. That’s roughly 44 to 56 in human years, then older (see our cat age chart). Many of the changes below start in the mature-adult years, so it pays to watch from about 7.

What Are the Earliest Physical Signs of Aging in Cats?

A duller, slightly matted coat from reduced self-grooming, often over the lower back and hips where bending hurts
Weight loss, even with a normal appetite, which is one of the most important signs to act on
Overgrown, thick claws from less scratching; International Cat Care notes older cats’ claws can curve back into the pads
Bad breath, tartar or dropping food, which are signs of dental disease
Stiffness after sleeping, or reluctance to jump onto furniture
Drinking and urinating more, often first noticed as bigger clumps in the litter box
Changes in the eyes, such as dilated pupils or bumping into things, which can signal high blood pressure affecting the retina

A senior cat with a slightly duller coat resting on a windowsill — A duller, less-groomed coat is often the first physical sign owners notice, usually before they connect it to joint pain.

Why Are Joint Problems So Easy to Miss?

Arthritis in cats rarely looks like limping. In a study of 100 cats aged 6 and older, 61% had arthritis in at least one joint. It was linked with decreased mobility, less grooming and more toileting outside the box. The 2023 AAHA Senior Care Guidelines note that cats rarely have the joint crepitus (grinding) vets feel in dogs. Owners are more likely to notice that the cat is “not getting on the counters as much” or “doesn’t like his window seat anymore,” to quote examples from the AAHA/AAFP guidelines. More in our guide to hidden arthritis pain in cats.

Why Do Aging Cats Change Their Behavior?

Behavioral shifts are often the first thing owners notice. A cat that used to greet you at the door may sleep through it. Increased vocalizing, especially at night, can signal hearing or vision loss, cognitive dysfunction, pain, hyperthyroidism or high blood pressure, according to the AAHA/AAFP guidelines. Less interest in play is normal in moderation, but a cat that stops playing altogether is worth watching closely.

Cognitive decline is common. One review estimates that 28% of cats aged 11–14 develop at least one age-related behavior problem, rising to over 50% at 15 and older (Gunn-Moore et al., 2007). See the signs of cat dementia owners usually miss.

Which Changes Need a Vet, and How Soon?

Change	What it can mean	How soon to act
Straining in the litter box with little or no urine	Urinary blockage (especially males)	Emergency, same day
Fast or labored breathing at rest, or sudden back-leg weakness	Heart disease or a blood clot	Emergency
Sudden blindness or dilated pupils	High blood pressure damaging the retina	Same day
Weight loss with a normal or big appetite	Hyperthyroidism, diabetes, kidney or gut disease	Within 1–2 weeks
Drinking and urinating more	Kidney disease, diabetes, hyperthyroidism	Within 1–2 weeks
New litter box accidents	Pain, urinary disease, cognitive decline	Within days
Jumping less, grooming less, stiffness	Arthritis	At the next visit, or sooner if it’s getting worse
Night-time yowling or confusion	Sensory loss, pain, thyroid, blood pressure, dementia	Within a few weeks

Some context on the medical causes. Cornell says chronic kidney disease affects up to 40% of cats over 10 and 80% of cats over 15. Hyperthyroidism affects about 10% of US cats over 10, according to the AAFP. Cornell also notes that a urethral blockage can kill in less than 24 to 48 hours. For the two most common medical causes of weight loss, see hyperthyroidism vs. kidney disease.

How Is Aging Different for Indoor vs. Outdoor Cats?

The AAHA/AAFP guidelines note that an indoor-only life can lower the risks of injury, predators, poisoning and infections. It can also raise the risk of obesity and behavior problems if the home isn’t enriched. Indoor cats’ slow changes can be harder to spot because there’s less activity to compare against. With outdoor or indoor-outdoor cats, owners may simply see them less. Either way, a monthly weigh-in and a quick written note of habits make gradual changes visible.

An older indoor cat resting comfortably at home — Indoor cats' gradual aging changes can be easy to overlook without regular weigh-ins.

When Should You Take an Aging Cat to the Vet?

Schedule checkups at least every six months once a cat is over 10, rather than once a year.
Ask about senior bloodwork, including kidney values, thyroid (T4) and a urine test, plus a blood pressure check.
Bring up any new litter box habits right away. They’re often the first visible sign of a health issue. The guidelines cite a 2016 study in which only 31.7% of cats with house-soiling had been seen by a vet for it. See why a senior cat stops using the litter box.
Track weight at every visit and at home. Unexplained loss is one of the most reliable early warning signs; see why a senior cat loses weight but still eats.
Don’t wait for limping. Cats show joint pain through reduced activity, not obvious lameness.

This article is for informational purposes only and does not replace guidance from your veterinarian.

Sources

American Animal Hospital Association / American Association of Feline Practitioners — 2021 AAHA/AAFP Feline Life Stage Guidelines, March 2021
American Animal Hospital Association — 2023 AAHA Senior Care Guidelines for Dogs and Cats, January 2023
Hardie EM et al., JAVMA — Radiographic evidence of degenerative joint disease in geriatric cats: 100 cases, 2002
Slingerland LI et al., The Veterinary Journal — Cross-sectional study of the prevalence and clinical features of osteoarthritis in 100 cats, 2011
Gunn-Moore D et al., Journal of Small Animal Practice — Cognitive dysfunction and the neurobiology of ageing in cats, 2007
Cornell Feline Health Center — Chronic Kidney Disease, January 2025
Cornell Feline Health Center — Hypertension, 2021
International Cat Care — Special considerations for senior cats, September 2025
American Association of Feline Practitioners — 2016 AAFP Guidelines for the Management of Feline Hyperthyroidism, 2016
Cornell Feline Health Center — Feline Lower Urinary Tract Disease, October 2016

FAQ

At what age is a cat considered a senior?

Over 10, under the 2021 AAHA/AAFP Feline Life Stage Guidelines, with 7 to 10 counted as mature adults. An older system used 'geriatric' for cats 15 and up, and International Cat Care still calls them 'super seniors,' but the current guidelines fold them into one senior stage. Individual health matters more than the number.

Why do cats hide signs of aging so well?

Cats are naturally good at masking pain and discomfort, a trait widely thought to help animals avoid looking vulnerable. Feline guidelines describe cats as stealthy at hiding distress. That's why aging usually shows up as small changes in habits, like jumping less or grooming less, rather than obvious limping or crying.

Is it normal for an older cat to sleep most of the day?

Sleeping more is common in senior cats, according to International Cat Care. But a sudden or dramatic increase, especially with a reduced appetite, less grooming or hiding, is worth mentioning to a vet rather than assuming it's 'just old age.'

Should I change my cat's litter box as they age?

Often, yes. Guidelines recommend lower edges so a senior cat can get in and out easily, a box at least one and a half times the cat's length, and boxes close to where the cat spends its time so it doesn't have to climb stairs. Any new litter box problem also deserves a vet check.

What's the most commonly missed early sign of aging in cats?

Reduced grooming is one of the easiest to miss. It shows up as a slightly matted, greasy or dull coat, especially over the back and hips, and owners often notice the coat before they connect it to joint pain. In one study, reduced grooming and mobility were both linked to arthritis.

How often should a senior cat see the vet?

At least every six months once a cat is over 10, according to the AAHA/AAFP guidelines, and more often for cats with ongoing conditions. AAHA's 2023 senior guidelines suggest bloodwork and a urine test every 6 to 12 months, plus regular thyroid and blood pressure checks.