The oldest cat in history is creme puff, this cat became 38 years, but the average cat lives around 14 years. How long your cat will live depends on many factors you can read them here: How Long Do Cats Live Really? Life Expectancy Of Cats.
One method the body uses to heal itself is by scarring. This generally occurs with injuries that penetrate the skin and/or muscle tissue. First, your white blood cells knit together to form a clot that stops the blood from leaving your body. Then, a protein called collagen forms at the site of the injury to repair the damage. In fact, this is the same type of tissue that was there originally, but the difference is in the way it forms.
Although muscles get injured most frequently, they also heal more easily on their own. Tendons, ligaments and joints, on the other hand, often take months or years to heal and often stay injured for a lifetime. From my studies I learned that there were hundreds of discrete injuries to muscles, tendons, ligaments, bursas, nerves and joints that could be precisely assessed, and understood and successfully treated.