The answer to that depends upon several factors. The care that you give your cat, the quality of the food that your cat eats and the kind of lifestyle that your cat lives. All these things play their part in the chances of your cat enjoying a long life.
Veterinary medicine has made some great advances in recent years, and this is one of the reasons the average age of domestic cats is increasing. A well cared for cat that is kept indoors and is fed a good nutritional diet, would be expected to live for about 15 years.
The most common disorder in cats is runny eyes. Infectious organisms such as the flu viruses or chlamydia cause conjunctivitis, an inflammation of the membranes lining the eyelids. This results in a discharge that is either watery and runny or thick and a greenish-yellow color. Occasionally a runny eye is caused by a disorder of the normal anatomy.
Tear glands continually produce secretions that lubricate the surface of the eyeball and flush particulate material into the tear ducts which then drain into the nose. If there's a blockage of the ducts, the tears have no choice but to spill over and run down the face. Blockage can occur if there has been earlier damage to the ducts or if the cat has abnormal anatomy.
Cats make great pets. They are quieter than dogs, require less care, and can provide their owners with plenty of attention and love. Also, cats adjust well to indoor living, take great care in grooming themselves, and are easily trained to use a cat box. For these reasons they can live in an apartment as well as a large house.