As we all know, cats age faster than people:

The average life expectancy of a human in the United States is 77.5 to 80 years.

The average life expectancy of an indoor cat is 12 to15 years.

The average life expectancy of an outdoor cat is 3 to 8 years.

Cats are "teenagers" until about 18 months old.
They become socially mature around 2-3 years of age.

Cats are considered "seniors" at 10 years of age
and "geriatric" at 15 yrs of age.
 

 


The chart below correlates cat years and human years:

Cat's Age                        Equivalent Human Age

6 months                                  10 years

1 year                                      15 years

18 months                                20 years

2 years                                     24 years

3 years                                     28 years

4 years                                     32 years

5 years                                     36 years
6 years                                     40 years

7 years                                     44 years

8 years                                     48 years

9 years                                     52 years

10 years                                   56 years

11 years                                   60 years

12 years                                   64 years

13 years                                   68 years

14 years                                   72 years

15 years                                   76 years

16 years                                   80 years

17 years                                   84 years

18 years                                   88 years

19 years                                   92 years

20 years                                    96 years

21 years                                   100 years

22 years                                   104 years

23 years                                   108 years

24 years                                   112 years

25 years                                   116 years