How Can You Tell How Old Your Cat Is?

There is no definite way of telling a cat's age accurately. But there are a several factors that you can observe for judging a cat's age. The following link discusses these factors in detail.
www.surroundedbycats.com

The best way is to ask your vet

Actually , dogs age 7 years to one human yr and cats age 10yrs to one human yr , the vet should be able to determine the animals age by its teeth

Basically what you do is how much your cat is in years and months then divide by the amount of people you have living with you its that simple (;

Check his teeth

Basically cat teeth are counted to measure its age. You can also measure cat's age by comparing it with human age. There is some specific formula that you can use to calculate age of your cat. Your cat age can be measure by growth of its body also.
If your cat is 1 year old that is equal to 15 human years.
In the consecutive 2nd year of cat's age you can add 9 years of human age.
Similarly, in 3rd consecutive year, add 4 human years in your cat's age.

There are many age calculators that are available built by experts so you can use them to find your cat's age.