How Old Is My Cat in Human Years?
· Pet Parents HQ
Find your cat’s age in the left column — the human equivalent is next to it.
| Your cat’s age | In human years | Life stage |
|---|---|---|
| 6 months | 10 | Kitten |
| 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 |
| 10 years | 56 | Mature |
| 12 years | 64 | Senior |
| 14 years | 72 | Senior |
| 15 years | 76 | Geriatric |
| 18 years | 88 | Geriatric |
| 20 years | 96 | Geriatric |
The maths behind it: 15 human years for the first year, 9 more for the second, then 4 for every year after. The reasoning is explained in what are cat years.
Don’t know your cat’s exact age?
Very common with rescues and strays. A few reasonable clues:
- Teeth. Kittens have all their adult teeth by 6–7 months. Slight yellowing suggests 1–2 years; tartar on most teeth 3–5; noticeable wear and missing teeth 10+.
- Coat. Young cats have soft, fine fur. Older cats develop coarser coats, sometimes with grey patches around the muzzle.
- Eyes. Young cats’ irises look smooth and clear; from about 12, many cats develop a slight cloudiness or lacy appearance to the iris.
- Activity. Not reliable on its own — plenty of 12-year-olds still tear around at 6am.
For kittens specifically, weight is the best single indicator: roughly one pound per month up to six months. The kitten age calculator turns weight and milestones into an age estimate.
What each stage means practically
Prime (3–6): the easy years. Keep weight in check — indoor cats gain quietly, and obesity is the biggest preventable health problem in cats. Portion properly with the cat food calculator.
Mature (7–10): annual vet visits with bloodwork become genuinely valuable. Watch for subtle weight loss, which is often the first sign of thyroid or kidney issues.
Senior (11–14): twice-yearly checkups. Consider raised food bowls, softer bedding, and a litter box with a lower entry — arthritis in cats is common and under-diagnosed because they hide it so well.
Geriatric (15+): comfort first. Many cats live happily here for years with managed conditions. Sudden changes in drinking, appetite or litter habits always warrant a call.
Get your cat’s exact figure — and their senior timeline — from the cat age calculator.