How long do cats live? Indoor vs outdoor lifespan
The average cat lives around 13–17 years, and indoor cats commonly reach 15–20. Cats that roam outdoors unsupervised face traffic, fights, disease and predators, and on average live much shorter lives.
Average cat lifespan
Most pet cats live between 13 and 17 years, and it’s not unusual for cats to reach 20. VCA puts the average indoor cat at 16–18 years. The record holder, Creme Puff, lived to 38.
Indoor vs outdoor cats
Indoor cats live roughly twice as long on average as cats that roam freely, mainly because they avoid cars, fights, infectious diseases, predators, poisons and extreme weather. Researchers at UC Davis have estimated that unsupervised outdoor cats may live only 2–5 years on average. A safe compromise is a catio, a secure garden enclosure or harness walks.
Cat years to human years
| Cat’s age | Roughly like a human aged |
|---|---|
| 1 year | 15–16 |
| 2 years | 21–24 |
| Each year after | + about 4 years |
| 10 years | about 53–56 |
| 15 years | about 73–76 |
| 18 years | about 85–88 |
The old “one cat year equals seven human years” rule isn’t accurate — cats mature very fast in the first two years, then age more slowly.
What affects how long a cat lives
- Lifestyle: indoor or supervised outdoor access.
- Weight: overweight cats have a higher risk of diabetes, arthritis and other diseases.
- Preventive care: vaccines, parasite control and regular check-ups.
- Dental health: gum disease is linked to kidney and heart problems.
- Spaying or neutering.
- Genetics: mixed-breed cats often live longer than some purebreds.
How to help your cat live longer
- Keep your cat indoors or give safe, supervised outdoor time.
- Feed a complete, balanced diet and keep them lean.
- See the vet yearly — twice a year for seniors (about 10+).
- Look after their teeth.
- Learn the subtle signs of illness: hiding, eating less, drinking more, litter box changes.
- Keep lilies and other toxic plants out of the house.
Frequently asked questions
How long do indoor cats live?
Commonly 15–20 years, depending on genetics and care.
What age is a senior cat?
Cats are usually considered senior from about 10 years old, though age-related changes often begin between 7 and 10.
Which cat breeds live the longest?
Siamese, Balinese, Russian Blue and American Shorthair cats are often cited as long-lived, frequently reaching 15–20 years.
Sources
This article is general information, not veterinary advice. Every pet is different — for questions about your own pet’s health, talk to your veterinarian.
