How old is a 17 year old cat in human years?
A 17 year old cat is about 84 in human years. By the veterinary life stage guidelines, a cat of 17 is a senior.
A 17 year old cat
Cat age against human age
The dot marks a 17 year old cat. The line rises fast in the first two years and then evenly.
Cat age chart around 17
| Cat age | Human years | Life stage |
|---|---|---|
| 15 | 76 | Senior |
| 16 | 80 | Senior |
| 17 | 84 | Senior |
| 18 | 88 | Senior |
| 19 | 92 | Senior |
After age two each cat year adds 4 human years, so 17 comes to 84 and 18 to 88. A cat of 18 will be still a senior.
Compared with the old rule
The old rule of seven human years for each cat year would make a 17 year old cat 119. The veterinary chart gives 84, so the old rule is 35 years too high. Cats grow up quickly in their first two years and then age at a steady pace.
Questions
How old is a 17 year old cat in human years?
About 84.
Is a 17 year old cat old?
By the veterinary life stage guidelines, a cat of 17 is a senior. The stages are kitten until 1 year, young adult from 1 to 6, mature adult from 7 to 10, and senior from 10 years on.
What is 84 human years in cat years?
About 17 cat years. Try the human years to cat years calculator for any age.
Is this exact?
No. Genetics, diet, indoor or outdoor life and health all affect how a cat ages, so treat the result as a general comparison. Ask your vet how often your cat should have checkups.
Other cat ages
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
For any age use the cat years to human years calculator. For dogs see dog years to human years.
Sources
- American Veterinary Medical Association (AVMA), guidance on converting a cat's age to human years (15 for year one, 24 for year two, 4 per year after).
- AAHA/AAFP Feline Life Stage Guidelines, 2021 (kitten, young adult, mature adult and senior age ranges).
Last reviewed 2026-10-26.