How long do cats live?
An indoor domestic cat lives, on average, 13 to 17 years — many reach 18 or 20. An outdoor cat averages just 2 to 5. The single biggest predictor of how long your cat will live is not breed or diet but whether it goes outside.
Quick answer
Indoor cat: 13–17 years typical, up to 20+. Outdoor cat: 2–5 years typical. The longest verified cat life was 38 years (Creme Puff, Austin, Texas, 1967–2005).
Forget "1 cat year = 7 human years." It's 15 in year one, 24 by year two, then +4 each year.
Cat age converter
AAHA / AVMA scaleNot "× 7". The first two cat years are heavy front-loaded; the rest is ~four human years each.
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The × 7 myth, and where it came from
The "multiply by 7" rule was always a back-of-envelope estimate, based on the rough observation that humans live to ~70 and cats to ~10. It was never accurate. Cats mature very fast in the first two years (reproductively adult by 6 months, fully grown by 12), then slow down. The American Animal Hospital Association and American Veterinary Medical Association both publish life-stage guidelines using the scale built into the calculator above: year 1 = 15 human years; year 2 = +9 (total 24); each year after = +4.
A 10-year-old cat is roughly 56 in human terms, not 70. A 15-year-old cat is around 76 — old, but not as ancient as the "× 7" suggested.
Indoor vs outdoor — the brutal gap
The gap is uncomfortable but consistent across the literature. American Humane and most veterinary epidemiology studies put outdoor cat life expectancy at 2 to 5 years, against 13–17 for indoor cats. The causes are unromantic: road traffic accounts for the largest share of premature deaths, followed by fights with other cats (and the FIV and FeLV viruses transmitted through bites), then dog attacks, predation in some regions, and untreated infectious or parasitic disease.
In Australia, the lifespan question runs into a wildlife question too — the Threatened Species Strategy puts free-roaming pet cats among the country's most consequential wildlife predators. Several Australian local councils now require cats to be contained, with some setting cat curfews enforceable by fine.
Life stages (the AAHA scale)
| Stage | Cat age | What's happening |
|---|---|---|
| Kitten | 0–6 months | Rapid growth, vaccinations, socialisation window closes around 9 weeks. |
| Junior | 7 months – 2 yrs | Reaches full body size; reproductive maturity from ~6 months. |
| Prime adult | 3–6 yrs | Peak physical condition. Annual vet check is enough. |
| Mature | 7–10 yrs | Equivalent to mid-40s in humans. Watch weight and dental health. |
| Senior | 11–14 yrs | Kidney, thyroid and arthritis checks should start every 6 months. |
| Geriatric | 15+ yrs | Most cats reach this stage if kept indoors. Care plan shifts to comfort and pain management. |
Breed differences
Lifespan varies meaningfully by breed, mostly because of conditions concentrated in closed breeding lines. The Siamese-Burmese family is famously long-lived; the Maine Coon and Ragdoll carry a higher incidence of hypertrophic cardiomyopathy; Persians are prone to polycystic kidney disease.
| Breed | Typical (yrs) | Note |
|---|---|---|
| Siamese | 15–20 | Sleek build, slow to age, often very vocal into old age. |
| Burmese | 16–18 | Closely linked to the Siamese; similar longevity. |
| Russian Blue | 15–20 | Quiet, healthy gene pool; long-lived. |
| Domestic shorthair (moggy) | 13–17 | Hybrid vigour — often outlives purebreds. |
| British Shorthair | 12–17 | Heavier build; obesity risk if overfed. |
| Persian | 12–17 | Polycystic kidney disease and breathing issues common. |
| Maine Coon | 9–13 | Largest domestic breed; predisposed to hypertrophic cardiomyopathy. |
| Ragdoll | 9–15 | Same cardiac risk as Maine Coons. |
| Sphynx | 8–14 | Heart conditions limit average lifespan. |
The oldest cat
The Guinness record holder is Creme Puff, owned by Jake Perry of Austin, Texas. Born 3 August 1967, died 6 August 2005 — 38 years and 3 days. Perry's previous cat, Granpa Rex Allen, lived to 34. Perry attributed it to an unconventional diet (bacon, eggs, broccoli, asparagus, coffee with cream and the occasional dropper of red wine). The vets, when asked, attribute it to indoor living and luck.
What you can change
- Keep them indoors — the single biggest lever. Adds an average of 10+ years.
- Desex. Desexed cats live ~1.5× longer than entire cats (Banfield Pet Hospital State of Pet Health report).
- Keep body weight in check. Feline obesity is now the most common diet-related illness in vet practice.
- Annual vet checks — twice yearly from age 7. Kidney disease in particular is detectable years before clinical signs.
- Dental care. Periodontal disease is implicated in feline kidney failure and heart disease.
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Frequently asked
How long do indoor cats live?
13 to 17 years is typical; 18 to 20 is common; 20+ happens. Big multi-cat household studies put the median at around 15.
How long do outdoor cats live?
2 to 5 years. The main causes of premature death are vehicles, fights/infection, and dog attacks.
What's the human-age equivalent of my cat?
Year 1 = 15. Year 2 = 24. After that, add 4 per year. So a 10-year-old cat is ~56; a 15-year-old is ~76.
Do desexed cats live longer?
Yes — about 1.5 times longer on average than entire cats (Banfield Pet Hospital data). Avoided pregnancies, fewer fights, lower cancer rates.
Do male or female cats live longer?
Females, by 1–2 years on average. The gap shrinks once both are desexed.
What's the oldest cat ever?
Creme Puff of Austin, Texas. 38 years and 3 days. Born 1967, died 2005. Guinness-verified.
Sources
- American Animal Hospital Association — Feline Life Stage Guidelines, 2021 update.
- American Veterinary Medical Association — feline ageing reference.
- Banfield Pet Hospital — State of Pet Health Report: desexed-vs-entire lifespan ratios.
- RSPCA Australia knowledgebase — cat lifespan and the indoor/outdoor question.
- Australian Government Threatened Species Strategy — pet and feral cats as wildlife predators.
- Guinness World Records — oldest cat ever (Creme Puff, 1967–2005, 38 years 3 days).
- O'Neill DG et al. (2015) — Longevity and mortality of cats attending primary care veterinary practices in England, Journal of Feline Medicine and Surgery 17(2).
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Related
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