Cats age quietly, and the household that tracks the quiet changes gives its cat the longest, most comfortable later years the species can offer. For Cats (Felis catus), whose indoor lifespans commonly reach 12 to 18 years and sometimes past 20, senior status arrives around 10 to 12 years, and the care program shifts with it: bloodwork twice a year, the diseases of the feline old age watched by name, and an environment adapted to joints that stiffen and kidneys that slow.
When a cat becomes a senior
The feline age scale runs mature from 7 to 10 years, senior from 10 to 12, and geriatric past 15, with indoor cats living far longer than the species' free-roaming averages allow. The visible markers accumulate slowly: the coat that needs more help, the sleep that lengthens past sixteen hours, the jump to the counter taken in two hops instead of one, and the lenses that haze with age without destroying vision. Inside, the changes matter more: kidney filtration declines, thyroid and blood pressure drift, muscle mass thins, and dental wear accumulates into the mouth pain that senior cats so silently carry.
The senior transition also changes what the household should expect from "normal." The cat that sleeps more, plays less, and drinks differently is reporting its physiology, and each shift is benign alone and diagnostic in combination. The written log that records when shifts happen, rather than absorbing them one quiet month at a time, gives the veterinarian the timeline that separates aging from disease, and the distinction is where senior care earns its keep.
The diseases of the feline old age
Three conditions dominate feline geriatrics, and all three are detectable early. Chronic kidney disease leads, progressing over years and surfacing first in the bloodwork and urine concentration that the senior screen runs, long before the weight loss and increased drinking that owners notice. Hyperthyroidism follows, the overactive thyroid of the middle-aged and senior cat that drives ravenous appetite with continuing weight loss, restlessness, and the vocalizing that owners mistake for demand; a blood test finds it and the treatments span medication, diet, and radioiodine. Diabetes completes the trio, arriving alongside the obesity the diet chapter works to prevent and presenting as the drinking-and-urinating pattern the litter box reports.
The rest of the senior list is equally predictable: dental disease near-universal, hypertension, high blood pressure that rides alongside kidney and thyroid disease and threatens the eyes and brain, arthritis in a majority of cats over twelve, whose jumping hesitations are the only sign, and the cancers of the late years, from the intestinal lymphoma to the masses the grooming survey finds. The heart contributes hypertrophic cardiomyopathy, the silent thickening that the murmur auscultation and the resting respiratory count catch before the crisis.
Arthritis, the hidden majority
Feline arthritis is the underdiagnosed condition of the species, affecting a majority of cats past twelve while presenting almost invisibly, because cats rarely limp and the signs are absences: the jump to the windowsill taken in two stages, the litter box with high sides that is suddenly avoided, the grooming that stops at the lower back, the grumpiness when lifted. The radiographs confirm what the history describes, and the treatment menu, the newer feline pain monoclonal, environmental ramps and steps, weight management, and the warm padded beds, returns behaviors the household had filed under age. The cat that "got old" at fourteen is usually the cat whose joints hurt at twelve, and the arthritis conversation at the senior visit is where the distinction gets made.
Kidney disease, the slow decline
Chronic kidney disease deserves its own portrait because it is the signature disease of the feline old age, affecting a large share of senior cats and progressing over years. The kidneys lose concentration first, which shows up as slightly larger urine clumps and slightly increased drinking long before the weight loss and vomiting of late stages; the bloodwork's creatinine and the urinalysis's concentration catch the decline at the stage where prescription kidney diets, hydration support, blood-pressure control, and the newer treatments slow the curve measurably. The household's role is the trend-watching the log does, the water bowl, the clump size, the weight, plus the hydration help that wet food and fountains provide. Cats managed well live years past their diagnosis, which is the return on the twice-yearly screen that found it early.
The senior veterinary calendar
The senior examination moves to twice a year, because cats age the equivalent of several human years in twelve months and the diseases above move at that speed. Each visit carries the physical examination, bloodwork with kidney and thyroid values, urinalysis with urine concentration, and blood pressure measured with the feline cuff, and the trend across visits is where the early disease surfaces, since a creatinine still in range but rising across three years is a finding only the trend reveals. Weight is the other trend line: the senior cat that loses a pound has lost a tenth of its body weight, a finding the scale catches and the eye forgives.
Dental assessment rides the same visits, because the resorption lesions and gum disease of the feline mouth suppress appetite and hide behind the face nothing has changed. New lumps are sampled rather than watched, the fine-needle aspiration that sorts benign from serious while removal is still small, and the blood pressure that the first senior visit establishes as baseline becomes the number that protects the eyes and kidneys for the rest of the cat's life.
The senior appetite problem
The senior cat's appetite is a monitoring station with two alarm directions. The appetite that rages while weight falls is the hyperthyroid or diabetic signature, and the appetite that fades is everything from dental pain to kidney disease to the nausea of late-stage illness, because cats stop eating for reasons that would only slow a dog down. The dangerous threshold arrives fast: a cat that eats nothing for two or three days risks hepatic lipidosis regardless of its starting weight, which is why the feline fasting clock is shorter than any other species' and why the cat that skips two days of meals is at the clinic, not waiting out the weekend. The adaptations that keep seniors eating, warmed food that smells stronger, shallow dishes that spare the whiskers, wide low bowls for the stiff neck, and the wet food the aging mouth prefers, are simple, and the household that knows the two-day rule has the alarm that matters most.
Adapting the territory
The senior cat's territory needs the same map with easier geography. Steps or ramps reach the favorite perches, the litter box gains a low entry and moves closer to the cat's resting zone, and a box appears on every floor the cat still uses, because the arthritic cat that cannot make the basement in time is not misbehaving. Food and water stations come closer together, bowls rise to a comfortable height, and the orthopedic bed that eases stiff joints replaces the hammock the cat no longer climbs to.
Grooming help is part of the adaptation, since the arthritic cat grooms its spine poorly and the coat mats where the tongue cannot reach; the combing session extends, and the claws need trims more often as scratching declines. Warmth matters more, with beds away from drafts and the heated pad the older cat gravitates to, and the night light helps the eyes that haze. What the territory must keep is its predictability, because the aging cat reads change as threat, and the furniture that stays put is comfort equipment.
Measuring the late years
The late years run on recorded data rather than daily impressions: the journal of appetite, weight, mobility, litter habits, and the activities this cat always loved, reviewed against the quality-of-life frameworks veterinarians use, with the good days counted against the hard ones. The senior cat's greatest medical advantage is that its three signature diseases, kidney, thyroid, and diabetes, are all manageable when caught early, which makes the twice-yearly calendar and the observation log the most valuable equipment the household owns. The aim is comfortable duration, pain controlled, weight held, nights quiet, and the closeness that senior cats famously deepen, and the household that ran the records will recognize the end the cat itself describes, gently and on its own schedule. The senior years are also the reward the earlier care earned: the indoor cat that was fed lean, vaccinated, and watched reaches those years with fewer diseases to manage, and the partnership that kept it well is the partnership that keeps it comfortable. Old age in a cat is not a diagnosis; it is the payoff schedule of the care routine, arriving on time and, with the records in hand, on the household's terms. The cat that reached fifteen on this program earned every one of its quiet, well-mapped years, and the household that kept the records gave it that map.