Feline Life Stages
The Scientific 15-9-4 Rule
Feline maturation is nonlinear; during their first 2 years cats complete adolescence and early adulthood, reaching equivalent age 24.
YRS
Frequently Asked Questions
What is the 15-9-4 rule for cat age?
A cat's first year equals approximately 15 human years, the second year adds 9 years (reaching age 24), and each subsequent year adds 4 human years.
When is a cat considered a senior?
According to feline veterinary guidelines, cats aged 7-10 are considered "mature", while those 11 years and older enter the "senior" stage.
Do indoor cats live longer than outdoor cats?
Yes. Indoor cats live an average of 13-17 years, whereas free-roaming outdoor cats average only 3-5 years due to trauma, infectious diseases, and malnutrition.
Cat-to-Human Age Conversion Table
| Cat Age | Human Equivalent | Life Stage |
|---|