PetYearsHow long do indoor cats live?
Most indoor cats live 13–17 years, and plenty reach their late teens or early twenties. Here’s what affects it — and how old your cat is in human years.
Size-aware estimate based on the AKC dog-age chart & veterinary life-stage guidance. A guide, not a diagnosis.
Average indoor cat lifespan
A healthy indoor cat typically lives 13–17 years. Many do better than that: reaching 18–20 is common, and some cats live into their early twenties. By contrast, cats who spend most of their time outdoors often live only a few years, because the outdoors brings traffic, predators, fights, poisons, and infectious disease.
Why indoor cats live longer
- No traffic or predators — the leading causes of sudden death in cats are simply removed.
- Fewer fights and injuries — less exposure to abscesses and bite-borne disease.
- Lower disease risk — far less exposure to FIV, FeLV, and parasites.
- Consistent food, water, and vet care — problems get caught earlier.
What helps an indoor cat live longer
- Keep a healthy weight — obesity shortens lifespan and drives diabetes and joint problems.
- Annual (or twice-yearly for seniors) vet check-ups and dental care.
- Enrichment — play, climbing, and scratching outlets keep indoor cats active and happy.
- Fresh water and a quality diet appropriate for their life stage.
How old is your cat in human years?
Cats age fast early on: a 1-year-old cat is roughly 15 in human terms, about 24 by age two, then around four human years per year after that. Use the cat age calculator above, or see lifespans by breed.
General education only, not veterinary advice. Every cat is an individual — ask your veterinarian about your cat’s health.