Cat years to human years

A cat's first year counts as about 15 human years, the second adds 9, and every year after adds 4. Pick an age for the full breakdown.

Cat’s age in years

Plus months

Cat age chart, 1 to 25 years

Cat's age	Human years	Life stage
1 year	15	Junior
2 years	24	Junior
3 years	28	Prime
4 years	32	Prime
5 years	36	Prime
6 years	40	Prime
7 years	44	Mature
8 years	48	Mature
9 years	52	Mature
10 years	56	Mature
11 years	60	Senior
12 years	64	Senior
13 years	68	Senior
14 years	72	Senior
15 years	76	Geriatric
16 years	80	Geriatric
17 years	84	Geriatric
18 years	88	Geriatric
19 years	92	Geriatric
20 years	96	Geriatric
21 years	100	Geriatric
22 years	104	Geriatric
23 years	108	Geriatric
24 years	112	Geriatric
25 years	116	Geriatric

Kitten ages

Under a year, each month counts for about 1.25 human years.

Cat life stages

Kitten0–6 months: Growing fast, learning to play and socialise, and needing kitten food.
Junior7 months–2 years: Reaching full size and full of energy. Behaviour is still adolescent.
Prime3–6 years: Settled, fit, and at their physical best. Yearly vet checks help keep it that way.
Mature7–10 years: Around the human 40s and 50s. Weight gain and slower play are common, so watch food and activity.
Senior11–14 years: Around the human 60s and early 70s. Many vets suggest check-ups twice a year from here.
Geriatric15+ years: The human 70s and beyond. Comfort, hydration, and regular vet care matter most.

Common questions

How old is a 1-year-old cat in human years?

About 15. The second year adds about 9 more, so a 2-year-old cat is around 24.

How long do cats live?

Indoor cats commonly live into their mid-to-late teens, and some reach 20 or more. Outdoor cats tend to have shorter lives on average because of traffic, injury, and disease.

When is a cat considered a senior?

Vets commonly treat cats as seniors from about age 11, which is roughly 60 in human years. Many recommend more frequent check-ups from that point.