How to Determine Your Cat's Age

Older cat getting his head scratched

Your veterinarian is your best partner for determining the current age of your cat and in planning a care program to ensure him the optimal quality of life and longevity. Veterinarians practice treating the whole cat, rather than treating a symptom or disease, and this philosophy carries over into determining a cat's age.

A thorough veterinary examination of the cat's whole body will generally reveal a close approximate age of the cat. Here are a few things veterinarians check to determine the age of a cat.


Yes, teeth are a good indicator of age, especially for kittens. Their initial baby teeth first emerge between two to four weeks. Their permanent teeth are developing above them, and by three to four months, will start to displace the baby teeth (also called deciduous teeth).

In older cats, the amount of staining (tartar) is also an indicator of age that veterinarians use. However, with pets' teeth cleaning products readily available, tartar may not be a good indicator depending on the diligence of the cat's caregiver in providing a dental care program.

While teeth are a good indicator of a cat or kitten's approximate age, they are not foolproof.

Sexual Maturity

Male cats reach sexual maturity (puberty) around the age of five months. Signs include territorial spraying of urine. Often their testicles become more prominent at that time. Many veterinarians now practice early spay and neuter. This not only helps prevent early pregnancies, which are harder both on the mothers and on the kittens, but the surgery itself is said to be easier on the cats at a younger age.

Female cats will have their first heat (estrus cycle) sometime between the ages of five and twelve months. A female cat will tell you she is experiencing estrus very visibly and vocally. According to, the length of daylight and weight of the cat also have some effect on the time of the queen's first estrus cycle. A female cat can become impregnated and give birth to her first litter by the time she is 7 1/2 months old.

Coat Development

A kitten's fur or hair, called coat, is baby-fine and soft. As a cat ages, its coat will thicken and coarsen somewhat. It may also change color, becoming darker or lighter in shade. When a cat attains senior status, it may even develop patches of white or gray individual hairs, much as humans do upon aging.


Healthy Kittens and cats during their maintenance years have eyes that are very clear and bright, with no evidence of tearing or discharging. Cats in their later years may develop a cloudy appearance of their eyes, including tearing, and/or discharge.

If you suspect your pet is sick, call your vet immediately. For health-related questions, always consult your veterinarian, as they have examined your pet, know the pet's health history, and can make the best recommendations for your pet.