How it works
Cats grow up quickly: a one-year-old cat is roughly comparable to a 15-year-old person, and a two-year-old to about 24.
After that, each cat year adds roughly four human years. This is a rough comparison, not a medical age.
Older cats hide illness well. Regular check-ups and a monthly weigh-in at home help spot changes early.
Quick reference
| Cat's age | Human years |
|---|---|
| 1 year | 15 |
| 2 years | 24 |
| 4 years | 32 |
| 6 years | 40 |
| 8 years | 48 |
| 10 years | 56 |
| 12 years | 64 |
| 15 years | 76 |
| 18 years | 88 |
Approximate human-year equivalents for cats.
Questions
How old is a 10-year-old cat in human years?
Roughly 56 — cats reach about 24 by age two, then age around four human years per cat year.
When is a cat considered senior?
Many vets consider cats senior from around 11 years, and some suggest more frequent check-ups from middle age.
How long do cats live?
Many indoor cats live into their mid-teens, and some well beyond. Breed, weight and health all play a part.
General guidance for healthy pets, not veterinary advice. Needs vary — your vet can advise for your pet.