Cats age much faster than humans in their first couple of years.
A one-year-old cat is roughly equivalent to a 16-year-old human.
After cats have matured a slower rate of 4 cat years to every human year is a realistic scale.
Indoor cats live to an average of 15 years which is equivalent to a human age of 76.
Cat Age Calculator:
Cat Age In Human Years Conversion Table
While it is not an exact science the table below shows how cats mature at a much faster rate than humans do:
|Cats Age||Human Equivalent||Life Stage|
|1 month||1 year||Kitten|
|2 months||3 years||Kitten|
|3 months||5 years||Kitten|
|4 months||7 years||Kitten|
|5 months||9 years||Kitten|
|6 months||11 years||Kitten|
|12 months||16 years||Young Adult|
|18 months||20 years||Young Adult|
|2 years||24 years||Young Adult|
|3 years||28 years||Physical Prime|
|4 years||32 years||Physical Prime|
|5 years||36 years||Physical Prime|
|6 years||40 years||Physical Prime|
|7 years||44 years||Mature|
|8 years||48 years||Mature|
|9 years||52 years||Mature|
|10 years||56 years||Old|
|11 years||60 years||Old|
|12 years||64 years||Old|
|13 years||68 years||Old|
|14 years||72 years||Old|
|15 years||76 years||Very old|
|16 years||80 years||Very old|
|17 years||84 years||Very old|
|18 years||88 years||Very old|
|19 years||92 years||Very old|
|20 years||96 years||Very old|
|21 years||100 years||Very old|
|22 years||104 years||Very old|
|23 years||108 years||Very old|
|24 years||112 years||Very old|
|25 years||116 years||Very old|
|38 years*||168 years||Very old|
*the oldest cat who ever lived.
Not sure how old your cat is? Read our article on how to tell a cats age.
Average Cat Life Expectancy
Cats life expectancies vary from breed to breed, things such as whether they have been neutered also impact their life expectancy.
As a general rule mixed breed cats are often hardier and have longer than average life spans. The factor which has the biggest impact on the length of your cats life is whether it is an indoor or an outdoor cat:
- An indoor cat can expect to live to an average of 15 years.
- Outdoor cats live an average of 5.5 years.
Read our article on how long do cats live for more information.