Cat age chart
1 month ≈ 1 · 3 months ≈ 4 · 6 months ≈ 10 · 1 year ≈ 15 · 2 years ≈ 24
After 2 years: Human age = 24 + 4 × (Cat age − 2)
After 2 years: Human age = 24 + 4 × (Cat age − 2)
Example: A 10-year-old cat is about 56 in human years — at the end of the mature-adult stage. At 15 it would be about 76.
Keeping an older cat healthy
- Yearly check-ups for adults, every 6 months for seniors.
- Watch for weight loss, drinking more, or changes in litter-box habits.
- Dental care matters — dental disease is very common in older cats.
Have a dog too? Try the dog age calculator.
Frequently asked questions
How do you convert cat years to human years?
The first year equals about 15 human years, the second adds 9 (24 in total), and each year after that adds about 4. A 10-year-old cat is roughly 56 in human years.
When is a cat considered senior?
The AAHA/AAFP feline life stage guidelines call cats senior from over 10 years old. Mature adults are 7–10 years.
How long do indoor cats live?
Commonly 12–18 years, and many live past 20. Outdoor cats have shorter average life spans because of traffic, disease and predators.
How old is a 6-month-old kitten in human years?
About 10 years — kittens develop very quickly in the first months.