How Old Is a Senior Cat?
Cats live considerably longer than dogs and their ageing trajectory is defined differently. The International Cat Care organisation and WSAVA (World Small Animal Veterinary Association) use the following broad classifications: cats aged 7 to 10 years are considered mature, cats aged 11 to 14 years are senior, and cats aged 15 years and above are super-senior or geriatric. Many cats today live well into their late teens and even early twenties, which means the senior phase of life can span a decade or more. Understanding where your cat falls on this spectrum helps you calibrate the level of monitoring and veterinary care that is appropriate.
Why Cats Hide Illness
One of the most important things to understand about senior cat health is that cats are instinctively very good at concealing signs of illness or weakness. This is a survival mechanism rooted in their evolutionary history as both predator and prey — in the wild, showing vulnerability invites attack. As a result, by the time a cat is displaying obvious signs of illness, the condition has often been present and progressing for some time. This means owners must actively look for subtle changes rather than waiting for a cat to present with obvious distress. Regular veterinary checks and keen observation at home are both essential.
WSAVA Senior Cat Guidelines: Bi-Annual Checks
WSAVA recommends that senior cats — broadly those aged 11 years and above — receive veterinary health checks every six months. Given how effectively cats conceal illness and how quickly certain conditions progress, annual checks are not sufficient for older animals. A bi-annual schedule allows your vet to build a picture of your cat's normal baselines and detect deviations early. Even in cats that appear entirely well, routine blood and urine testing at these checks frequently identifies conditions such as early kidney disease, hyperthyroidism, or hypertension before any clinical signs are apparent.
Common Conditions in Senior Cats
Several conditions become substantially more common as cats age, and every owner of a senior cat should be familiar with them:
- Chronic Kidney Disease (CKD) — this is the single most common condition in older cats. Studies suggest that 30 to 40 per cent of cats over 12 years of age are affected to some degree. The kidneys gradually lose function over time, and because kidneys have enormous reserve capacity, signs may not appear until significant damage has occurred.
- Hyperthyroidism — the thyroid gland becomes overactive, producing excess thyroid hormone. This is extremely common in cats over 10 years of age. Classic signs include weight loss despite a good or increased appetite, restlessness, increased vocalisation, a fast heart rate, and occasionally vomiting or diarrhoea. It is highly treatable once diagnosed.
- Diabetes mellitus — more common in middle-aged to older cats, particularly neutered males and those that are overweight. Signs include increased thirst, increased urination, weight loss, and a characteristic "plantigrade" stance where the cat walks on its hocks rather than on its toes.
- Hypertension (high blood pressure) — often occurs secondary to CKD or hyperthyroidism. Left untreated, hypertension can cause sudden blindness, strokes, and heart changes. Blood pressure monitoring should be part of every senior cat check.
- Dental disease — affects the vast majority of cats over three years of age and becomes increasingly severe with age. It is a significant source of chronic pain that is often undetected because cats continue to eat despite mouth pain.
- Osteoarthritis — substantially underdiagnosed in cats because they do not vocalise pain in the way dogs do. Signs are subtle: reluctance to jump, changes in grooming behaviour, reduced activity, and a less-than-perfect coat.
- Cognitive Dysfunction Syndrome (CDS) — the feline equivalent of dementia. Signs include disorientation, vocalising at night (often described as yowling), changes in sleep patterns, reduced interaction, and house soiling.
Warning Signs Not to Ignore
The following changes in your senior cat should prompt a veterinary appointment:
- Weight loss — any noticeable weight loss in a senior cat should be investigated, even if the cat appears to be eating normally. Hyperthyroidism, diabetes, CKD, and cancer can all cause weight loss.
- Increased drinking or urination — often the first detectable sign of CKD or diabetes. Monitor the litter tray for unusually large clumps or increased frequency.
- Vomiting — occasional vomiting (hairballs, for instance) can be normal, but frequent or persistent vomiting is not. CKD, hyperthyroidism, and inflammatory bowel disease are among the causes.
- Changes in litter tray habits — going outside the tray, straining, blood in the urine, or changes in stool consistency all warrant investigation.
- Hiding or withdrawal — a cat that suddenly spends more time hidden away or is less interested in interaction may be unwell or in pain.
- Night-time vocalisation — loud yowling at night, particularly in a cat that did not previously do this, can indicate hypertension, cognitive dysfunction, or hyperthyroidism.
- Unkempt coat — cats that normally groom well but begin to look scruffy may have arthritis making grooming painful, or may be unwell for another reason. A poor coat is always worth investigating.
- Changes in jumping ability — reluctance or inability to jump onto previously accessible surfaces can indicate arthritis or muscle weakness.
IRIS Staging for Chronic Kidney Disease
If your cat is diagnosed with CKD, your vet will likely use the IRIS (International Renal Interest Society) staging system to classify the severity of the disease. IRIS staging runs from Stage 1 (minimal loss of kidney function, often detectable only on specialist testing) through to Stage 4 (severe loss of function with significant clinical signs). Staging helps guide treatment decisions, including when to start dietary modification, phosphorus binders, and blood pressure treatment. The stage is based on resting blood creatinine levels taken on at least two separate occasions, and is further sub-staged based on the presence of protein in the urine and blood pressure.
SDMA Testing for Early Kidney Detection
SDMA (symmetric dimethylarginine) is a relatively newer kidney biomarker that can detect reduced kidney function earlier than traditional creatinine testing — in some cases identifying CKD when up to 40 per cent of kidney function has been lost, compared to the 65 to 75 per cent loss required before creatinine rises above the reference range. Many veterinary practices now include SDMA in their senior blood panel as standard. Early detection allows dietary and medical intervention to begin sooner, which can meaningfully slow disease progression.
Blood Pressure Monitoring in Senior Cats
Blood pressure should be measured at every senior health check and in any cat diagnosed with CKD or hyperthyroidism, as these conditions frequently cause secondary hypertension. In cats, blood pressure is typically measured using a Doppler device with a small cuff placed on a limb or the tail. Hypertension is treated with medication (most commonly amlodipine in cats) and regular monitoring is needed to ensure levels remain controlled.
Feeding Senior Cats
Nutritional management is an important part of senior cat care. For cats with CKD, diets lower in phosphorus are recommended from IRIS Stage 2 onwards, as phosphorus retention accelerates kidney damage. Prescription renal diets have been shown in controlled studies to extend survival times in cats with CKD. In cats with hyperthyroidism, nutritional management must be balanced carefully as both conditions often occur together. Always take dietary advice from your vet or a veterinary nutritionist rather than selecting a "senior" food based solely on marketing claims, as the nutritional needs of senior cats vary considerably depending on their health status.