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How Old Is My Cat in Human Years? Cat Age Chart and Life Stages

Cats grow up fast. A 1-year-old cat is about 15 in human years, a 2-year-old about 24, and after that each cat year adds about 4 human years. So a 5-year-old cat is about 36, a 10-year-old about 56, and a 15-year-old about 76.

Cat age chart

Cat age	Human years	Life stage
1	15	Junior
2	24	Junior
3	28	Adult
5	36	Adult
7	44	Mature
10	56	Mature
12	64	Senior
15	76	Geriatric
18	88	Geriatric

Cat life stages — what changes

Kitten (under 1 year): rapid growth, frequent small meals, vaccinations and play.

Junior (1–2 years): still maturing; switch to adult food around 12 months.

Adult (3–6 years): the prime years — measured meals and regular vet visits keep weight healthy.

Mature (7–10 years): weight and dental health need more attention; yearly check-ups matter.

Senior (11–14 years): senior check-ups, joint-friendly food and easy access to water and litter.

Geriatric (15+ years): gentle routines, soft food if teeth hurt, and twice-yearly vet visits. Many cats reach this stage — cats commonly live 13–17 years, and some well into their twenties.

Do cats age differently from dogs?

Yes, in one important way: after age two, cats age at a steady rate of about 4 human years per year, whatever their size. Dogs are different — their rate after age two depends on breed size (4 to 7 per year). That is why a cat calculator only needs age, while a dog calculator needs size or breed too.