Domestic cats may live for 20 years or more if well cared for and early veterinary attention may be able to sort out problems before they become serious. Age is not a reason to accept ill health and by keeping your cat well you can ensure that they have a good quality of life.
One of the joys of cats is their independence. As your cat gets older it will need you more than ever. You are the person who knows her better than anyone and you will be able to detect small changes that may indicate all is not well.