Key Takeaways
Senior Cat
Cats are generally considered 'senior' from around age 11, and 'geriatric' from about age 15. At these life stages, the body undergoes measurable changes — in organ function, metabolism, sensory ability, and behaviour — that require owners to adjust how they feed, house, and monitor their cat. Understanding these shifts early allows for proactive rather than reactive care.
The American Association of Feline Practitioners (AAFP) classifies cats aged 11–14 as 'senior' and those 15 and older as 'geriatric,' though individual variation is significant and biological age can differ from chronological age.
What Changes as Cats Age
Ageing in cats is gradual, which makes it easy to miss early signs of change. Muscle mass typically decreases with age — a process called sarcopenia — while fat distribution shifts. The digestive system becomes less efficient at absorbing certain nutrients, particularly protein, even when food intake stays the same. Organ function, especially in the kidneys, liver, and thyroid gland, is increasingly prone to disease.
Sensory changes are also common. Hearing loss, reduced visual acuity, and a dulled sense of smell can affect how a cat navigates its environment and engages with food. Dental disease, present in the majority of cats over ten, contributes to pain and reduced appetite. Arthritis affects joint mobility more than many owners realise — studies suggest it is present in a significant proportion of cats over 12, though cats rarely limp in the obvious way dogs do.
Behaviourally, senior cats may seek more warmth, sleep in different locations, vocalise more (particularly at night), or become less tolerant of household disruption. These changes are not simply personality quirks — they often reflect underlying physical discomfort or cognitive change. See our guide on cat health warning signs owners frequently overlook for a closer look at subtle signals worth monitoring.
Common Health Conditions in Senior Cats
Several conditions are disproportionately common in older cats and are worth understanding proactively.
- Chronic kidney disease (CKD): One of the leading causes of illness and death in older cats. The kidneys' filtering capacity declines over time, and early-stage CKD often has no obvious symptoms. Blood and urine testing can detect it before signs appear.
- Hyperthyroidism: An overactive thyroid gland, caused most often by a benign tumour, produces excess thyroid hormone. It can cause weight loss despite increased appetite, restlessness, and elevated heart rate. It is highly manageable when diagnosed.
- Diabetes mellitus: More common in overweight and older cats. Signs include increased thirst, urination, and gradual weight loss. With appropriate veterinary management, many diabetic cats live comfortably.
- Dental disease: Causes chronic pain that reduces appetite and affects quality of life. Regular dental evaluations and professional cleaning under anaesthesia — where appropriate for the individual cat — are part of standard senior care.
- Cognitive dysfunction syndrome (CDS): An Alzheimer's-like condition in cats, causing disorientation, altered sleep-wake cycles, and changes in social interaction. It is under-recognised but more common than previously thought in cats over 15.
Overlapping Symptoms Require Veterinary Diagnosis
Many conditions common in senior cats — including kidney disease, hyperthyroidism, and diabetes — share symptoms such as weight loss, increased thirst, and appetite changes. No symptom alone is diagnostic. A veterinary examination combined with blood and urine panels is the only reliable way to distinguish between these conditions and guide appropriate care.
Because many of these conditions share overlapping symptoms — weight loss, changes in appetite, increased thirst — diagnosis requires veterinary examination and laboratory testing, not observation alone. Early detection through routine screening meaningfully improves outcomes.
Adjusting Diet for an Ageing Cat
Nutritional needs shift as cats get older, and there is no single diet that suits every senior cat. The right approach depends on whether your cat is managing a healthy weight, has lost muscle mass, or has been diagnosed with a specific condition.
For generally healthy senior cats, veterinary nutritionists typically emphasise high-quality, highly digestible protein to counteract muscle loss. Hydration becomes more critical as kidney function declines — wet food is often recommended as a practical way to increase water intake. Phosphorus restriction becomes important if kidney disease is present, as excess phosphorus accelerates kidney damage.
Caloric needs may decrease if a cat becomes less active, but some older cats actually lose weight and require more calorie-dense food. Monitoring weight and body condition score at home — and at every vet visit — helps identify trends early. Our article on wet food vs dry food for cats provides a detailed look at the trade-offs relevant to cats at any life stage.
Track Weight at Home Between Vet Visits
Weight loss is one of the earliest detectable signs of many senior cat conditions, but it can be easy to miss when you see your cat daily. Weigh your cat monthly using a kitchen or baby scale — even half a pound of loss over a few months is significant in a cat and worth discussing with your vet.
Home Environment and Routine Adjustments
Small changes to your home can make a meaningful difference to a senior cat's daily comfort and independence. Arthritis and reduced muscle strength make previously easy manoeuvres — jumping to favourite perches, stepping into a litter box — more difficult or painful.
Consider the following adjustments:
- Replace high-sided litter boxes with lower-entry options, or add a ramp or step.
- Provide ramps or pet stairs to reach beds, sofas, or window perches the cat still wants to access.
- Ensure warm, draught-free resting spots — older cats thermoregulate less efficiently.
- Keep food, water, and litter stations on the same floor your cat uses most, reducing unnecessary stair climbing.
- Maintain predictable routines, as senior cats — particularly those with early cognitive changes — are more easily stressed by household disruption.
For cats that spend time outdoors, ageing warrants a reassessment of whether that access remains safe and appropriate. Our article indoor vs outdoor cats: health risks and lifestyle trade-offs covers this in detail. Indoor enrichment becomes especially valuable as mobility or outdoor access changes — see The Indoor Cat Handbook for practical ideas.
Grooming also requires more owner involvement as cats age. Older cats may struggle to reach certain areas, leading to matting or hygiene issues. Our at-home cat grooming guide explains how to support your cat's coat and claw care safely.
This article provides general information about senior cat care and is not a substitute for professional veterinary advice. If you have concerns about your cat's health, consult a licensed veterinarian.