Cat Age Chart
The complete cat age chart, converting cat years to human years from kitten to 25 — with the life stage at each age and what it means for care.
Cat years to human years chart
| Cat's age | Human years | Life stage |
|---|---|---|
| 1 month | 1 | Kitten |
| 3 months | 4 | Kitten |
| 6 months | 10 | Kitten |
| 9 months | 13 | Junior |
| 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 |
| 18 years | 88 | Geriatric |
| 20 years | 96 | Geriatric |
| 22 years | 104 | Geriatric |
| 25 years | 116 | Geriatric |
The formula
every year after = +4 human years
Cats compress an entire childhood and adolescence into twelve months — which is why a six-month-old kitten behaves more like a ten-year-old child than a toddler — and then age at a strikingly consistent four human years per calendar year. More detail inwhat are cat years.
What each stage means for care
| Stage | Age | Care focus |
|---|---|---|
| Kitten | 0–6 months | Vaccinations, socialization, 3–4 meals a day |
| Junior | 7 months–2 years | Desexing, switch to adult food, establish routine |
| Prime | 3–6 years | Annual checkups, weight control, dental care |
| Mature | 7–10 years | Annual bloodwork, watch for subtle weight loss |
| Senior | 11–14 years | Twice-yearly vet visits, kidney and thyroid screening |
| Geriatric | 15+ years | Comfort, accessibility, six-monthly monitoring |
Don't know your cat's age?
For kittens, weight is the quickest guide — roughly a pound per month up to six months. Thekitten age calculator estimates it from weight and milestones, and the cat dental chart shows how vets narrow an adult cat's age from tooth wear and tartar.
Frequently asked questions
How do you calculate cat years?+
A cat’s first year equals about 15 human years, the second adds 9 (so a 2-year-old cat is 24), and every year after adds 4. So a 10-year-old cat is 56 and a 15-year-old is 76.
Do all cat breeds age at the same rate?+
Essentially yes. Unlike dogs, where size dramatically changes the aging rate, cats age at a near-uniform rate across breeds. Maine Coons take longer to finish growing (up to 3–4 years) but age at the same pace thereafter.
When is a cat a senior?+
Vets consider cats senior from about 11 years — 60 in human terms — and geriatric from 15. From 11, twice-yearly checkups with kidney and thyroid bloodwork are the standard recommendation.
How long do cats live?+
Indoor cats typically live 12–18 years and often reach 20. Outdoor cats average considerably less due to traffic, predators and disease. Lifestyle is the single biggest factor an owner controls.