How Long Do Cats Live? Average Lifespan & What Affects It

Last updated April 22, 2026 · 7 min read

A healthy, well-cared-for indoor cat today can reasonably be expected to live 12 to 18 years. Some make it past 20. The cat with the longest verified lifespan, a Texas cat named Creme Puff, lived to 38. But averages hide huge variation, and the gap between an indoor cat and an outdoor cat is large enough to surprise most owners.

The headline numbers

Across the studies vets cite most often, cat lifespan tends to cluster around these ranges:

• Indoor cats: 12 to 18 years on average, with some reaching 20.
• Outdoor-only cats: 2 to 5 years on average. Many die in their first or second year.
• Indoor/outdoor cats: 7 to 12 years on average, depending on environment.
• Feral colony cats: typically less than 3 years without human care.

The indoor-vs-outdoor gap is the biggest lifespan factor for cats. Cars, predators (coyotes, dogs, raptors), infectious disease (FIV, FeLV, panleukopenia), parasites, fights, poisoning, and exposure to weather all stack up faster outside than people realize. Indoors removes nearly all of those failure modes at once.

Mixed breeds vs purebreds

On average, mixed-breed (“domestic shorthair” or “domestic longhair”) cats live slightly longer than purebreds, usually 1 to 2 years. The reason is the same as in dogs: hybrid vigor. A larger gene pool dilutes the recessive disease genes that get concentrated in tight breed lines.

Specific purebreds vary widely. Burmese cats often live 15–18 years, Russian Blues 15–20, and Siamese can hit 20. Maine Coons average closer to 10–15. Persians, due to their inherited kidney disease (PKD) risk and brachycephalic facial structure, typically land at 12–17. Sphynx cats, with their narrower gene pool and a higher rate of hypertrophic cardiomyopathy, typically reach 8–14. Our breed lifespan article breaks this down further.

What actually adds years (and what doesn’t)

Big lifespan-extenders

• Keeping the cat indoors. The largest factor by a wide margin. Easily 5+ years on average.
• Spaying or neutering. Removes the risk of reproductive cancers and dramatically reduces roaming, fighting, and FIV/FeLV exposure. Spayed females typically live 39% longer than intact females; neutered males 62% longer than intact males in large insurance datasets.
• Lean body weight. Obesity is associated with diabetes, joint disease, hepatic lipidosis, and shorter life. Maintaining a body condition score of 4–5 out of 9 (5 is ideal) throughout adulthood is one of the most impactful things an owner can do.
• Regular vet care. Annual visits through age 7, then twice-yearly. Bloodwork catches kidney disease, hyperthyroidism, and diabetes years before symptoms appear.
• Dental care. Dental disease is implicated in kidney and heart problems through chronic low-grade infection. Cats with managed dental health live longer with fewer comorbidities.

Smaller but real factors

• Quality diet appropriate for life stage. The specific brand matters less than getting the basics right: complete and balanced, appropriate calories, plenty of water.
• Hydration. Cats are descended from desert ancestors and drink poorly. Wet food, fountains, and multiple water stations all help.
• Low stress. Chronic stress increases idiopathic cystitis and stress-related illness in cats. Multi-cat households need enough resources (food, water, litter boxes, vertical space) to avoid competition.
• Vaccination history. Core vaccines prevent diseases (panleukopenia, herpesvirus, calicivirus, rabies) that can kill or weaken cats lifelong.

What doesn’t matter as much as people think

A few common beliefs about cat lifespan that turn out not to hold up:

• “Raw diet extends life.” There is no peer-reviewed evidence raw diets extend feline lifespan, and they introduce real foodborne pathogen risk to both cats and their humans.
• “Grain-free is healthier.” No evidence of lifespan benefit for cats. Grain content is largely irrelevant; the relevant question is whether the food is complete, balanced, and appropriate calorie level.
• “Bigger cats live shorter lives.” Unlike dogs, body size within cats doesn’t predict lifespan well. A Maine Coon doesn’t die young because it’s big.
• “Outdoor cats are happier so they live longer.” The research is unambiguous in the other direction.

How long has your cat probably got?

If your cat is currently:

• Under 5: probably 8–15 more years if indoor and healthy. Plenty of time.
• 5 to 10: middle adulthood. Start twice-yearly vet visits at age 7 and lock in weight management now.
• 10 to 14: senior. 3–7 more years is reasonable for a well-managed indoor cat with chronic conditions under control.
• 15+: geriatric. Each year is a gift; focus is comfort and stability.

Want to see your cat’s exact life stage and the equivalent human age? Use our free cat age calculator. It runs the AAHA-aligned formula and tells you which stage your cat is in, with care notes for that stage.

The best summary

An indoor cat with a normal weight, regular vet visits, and a clean dental record has very good odds of seeing 16 or 17. An outdoor cat with otherwise identical genetics is far less likely to see 8. The biggest lever is the easiest one: keep them inside, keep them lean, and bring them in for bloodwork once a year, twice once they hit seven.

Written by the Cats Age Calculator editorial team · How we research & fact-check