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Senior Cat Health Statistics: What the Numbers Actually Say

Senior cat health statistics, sourced and in one place: how common kidney disease, arthritis, and dental disease really are in cats past ten.

By Nora Bishop · September 1, 2026 · 10 min read

The senior cat health statistics worth knowing come down to three numbers. Cornell's Feline Health Center puts chronic kidney disease at up to 40% of cats over the age of 10 and 80% of cats over the age of 15. VCA puts arthritis at about 90% of cats over 10 years old experience OA in at least one joint. Cornell puts dental disease at between 50 and 90% of cats older than four years of age. Those three between them describe most of what goes wrong in an aging cat, and every figure on this page is quoted from a veterinary source and linked back to it.

An older tabby cat resting calmly and looking toward the camera
Numbers gathered across a whole species describe the odds she lives with, not the cat in front of you.

The short version: roughly 40% of cats over ten have kidney disease, rising to 80% past fifteen. About 90% of cats over ten have arthritis in at least one joint. Half or more have dental disease well before old age. Hyperthyroidism typically arrives around age twelve. When older cats who seemed well were screened, about one in five turned out to be hyperthyroid, and cats followed from middle age nearly all developed something, most of them more than one thing. And cats living into their twenties, once remarkable, are no longer rare.

How common are the diseases of old age?

Most of the conditions that shape a cat's later years are common enough that a senior cat owner should treat them as likely rather than unlucky. The figures below are each quoted from the source linked beside them.

Condition What the source says Source
Chronic kidney disease up to 40% of cats over the age of 10 and 80% of cats over the age of 15 Cornell Feline Health Center
Arthritis about 90% of cats over 10 years old experience OA in at least one joint VCA
Pain from arthritis specifically affecting more than 90% of cats 10 years of age and older VCA
Dental disease between 50 and 90% of cats older than four years of age Cornell Feline Health Center
Cognitive dysfunction half of cats over the age of 15 PetMD
Hyperthyroidism, typical age the average age of affected cats is approximately 12 years VCA
Asthma asthma is a disease of the lower airways of the lungs that affects between 1 and 5% of cats Cornell Feline Health Center
Lymphoma, typical age at diagnosis Gastrointestinal lymphoma is most often diagnosed in cats 9 to 13 years of age VCA

Two of those rows deserve reading together. Cornell reports that at least 60% of cats diagnosed with hypertension also have signs of CKD. The diseases of old age travel together, which is why a cat diagnosed with one gets checked for the others. The fuller picture on each sits in the guides to chronic kidney disease, arthritis, and dental disease.

What do studies of cats who seemed well find?

The figures in the table describe how common each disease is once it is looked for. Two studies published in 2026 asked a slightly different question: what turns up in cats who arrive for a routine visit with nothing obviously the matter. Between them they are the closest thing to a sourced answer to the question every senior cat owner actually has, which is what the odds are that she has something and I do not know it.

The first, a 2026 study in the Journal of Veterinary Internal Medicine, screened 549 cats aged eight and older at two UK clinics, median age 13.5, with a physical exam, bloodwork, and in almost every case a blood pressure reading. Hyperthyroidism was diagnosed in 19.2% of the cats tested for it, roughly one in five. Kidney disease far enough along to show in the blood was found in 11.4%, high blood pressure in 7.1%, and severe dental disease in 6.1%. These were routine screening visits rather than sick visits. The authors' conclusion: Routine medical health screening in older cats is useful in detecting diseases, many of which would benefit from prompt veterinary intervention.

That 11.4% for kidney disease sits well below Cornell's "up to 40%," and the gap is worth understanding rather than picking a side. The screening study counted only cats whose kidney values were already abnormal. The earliest stage of the disease does not move a single blood test, which is why one snapshot undercounts it and why repeat testing is the tool that catches it.

The second study is the Cat Prospective Ageing and Welfare Study, published in Frontiers in Veterinary Science, which followed 209 pet cats for up to seven years. Cats were enrolled at middle age and attended a veterinary examination every 6 months, which makes it the rare set of figures that describes what happens to ordinary cats over time rather than which cats turned up sick. Over the study, Dental disease (84%), abnormalities on orthopedic examination (82%) and heart murmurs (59%) were most prevalent within the cohort. The headline is how few cats stayed clear of everything: Most cats (96%) developed at least one abnormality on veterinary examination, and multimorbidity was common, with 175 cats (84%) developing two or more morbidities during the study. The median life expectancy was 15.2 years, and cats already showing muscle loss at middle age had about twice the risk of death over the study compared with cats who were not.

An earlier paper from the same cohort tracked body condition visit by visit and found that muscle goes before weight does. On its 30-point muscle score, cats slipped from 30 to 28 between ages seven and ten and then fell faster, to 15 by sixteen. After age 10, the cats had a greater probability of mild muscle loss than no muscle loss, and by age 14, they were more likely to be underweight than obese. The guide to muscle wasting in cats covers what that looks like from the outside and what to do about it.

What changes with age itself?

Some of the numbers describe aging rather than illness. Cornell's older-cat guidance observes that today, it's not unusual for veterinarians to have feline patients in their twenties, and that not long ago, cats were considered seniors at eight years old. The threshold moved because the cats did. What counts as old now starts at ten, and the cat age calculator translates any age into the human equivalent.

Appetite and body needs shift on their own timetable. VCA notes that a cat's energy requirements start to increase around 11 years of age, which reverses the trend of middle age and catches many owners out. And the outer edge of feline lifespan is further away than most people guess: Guinness World Records lists that the oldest cat ever is Creme Puff who was born on 3 August 1967 and lived until 6 August 2005, reaching an amazing 38 years and 3 days. More on the ordinary range in how long cats live.

Which numbers should actually change what you do?

Prevalence figures earn their keep when they change a default, and four of these do.

  • Arthritis at 90% flips the default. If nine in ten cats over ten have arthritic change in at least one joint, the sensible working assumption for an old cat is that she has some, and that she is hiding it, rather than that she is fine until she limps. That is an argument for ramps and low-sided boxes before there is an obvious problem, not after.
  • Kidney disease at 40% makes routine bloodwork the point of the visit. A disease that common, and that quiet in its early stages, is the reason the annual panel matters more than the annual look. Repeat testing is what catches it, which is covered in senior cat checkups.
  • Hyperthyroidism averaging twelve gives you a window. A cat losing weight with a good appetite in her low teens fits the most treatable serious disease on the list. That combination earns a blood test rather than a wait.
  • Muscle loss at middle age doubling the risk of death moves the starting line. The cohort study's own reading of its data is that targeted strategies to promote healthy aging should start from middle age. In practice that means running a hand along the spine and over the shoulders of a seven-year-old cat, not only a fourteen-year-old one, and treating a thinning back as something to raise at the next visit rather than a normal part of getting older.

What these numbers cannot tell you

Every figure here describes a population, not your cat. Prevalence is the share of cats affected, so a 90% figure says nothing about whether the animal asleep beside you is in the 90 or the 10. Most of the numbers in the table also come from cats who were seen by vets and worked up, which tends to overcount the sick and undercount the quietly well; the screening and cohort studies above are the partial corrective, and even they describe UK cats whose owners brought them in for routine visits, which is its own kind of selection. Ranges as wide as 50 to 90% for dental disease reflect real disagreement between studies rather than precision, and they should be read as "very common" rather than as a specific odds calculation.

None of that makes them useless. It makes them a way to know what is likely and what to look for, which is a different job from knowing what is true of one cat. Only her vet, her bloodwork, and your own daily watching can do that.

Frequently asked questions

What percentage of senior cats get kidney disease? Cornell's Feline Health Center puts it at up to 40% of cats over the age of 10 and 80% of cats over the age of 15. It is the single most common serious disease of feline old age.

What percentage of cats get arthritis? VCA reports about 90% of cats over 10 years old experience OA in at least one joint, and describes pain from it as affecting more than 90% of cats 10 years of age and older. Cats rarely limp, so it usually shows up as jumping less or sleeping somewhere new.

How many cats have dental disease? Cornell puts it at between 50 and 90% of cats older than four years of age, which means it usually arrives long before a cat is old.

What is the average age of hyperthyroidism in cats? VCA states that the average age of affected cats is approximately 12 years. Weight loss alongside a strong appetite is the classic pairing.

How many senior cats have more than one health problem? Most of them, once they are old enough. In the Cat Prospective Ageing and Welfare Study, which followed 209 cats from middle age for up to seven years, multimorbidity was common, with 175 cats (84%) developing two or more morbidities during the study. Dental disease, joint abnormalities found on examination, and heart murmurs were the three most common findings.

How old was the oldest cat ever? Guinness World Records lists Creme Puff of Austin, Texas at an amazing 38 years and 3 days. Ordinary long-lived cats reach their late teens and twenties.

The bottom line

I keep a notebook of Biscuit's numbers, one line per visit, going back years. Read down the page and it says something no single statistic on this page can: her creatinine climbing slowly, her weight holding, the year the thyroid test came back fine again. The population figures told me what to watch for. The notebook is the only place I can see what is actually happening to her.

Sources