Actually, the average life span for an American Pit Bull Terrier is 12-14 years. I have an 11 year old APBT and he is still going strong with no health issues.Please research pit bulls. You will see they are not good protection dogs. They LOVE people.ctually, the average life span for an American Pit Bull Terrier is 12-14 years. I have an 11 year old APBT and he is still going strong with no health issues. Please research pit bulls. You will see they are not good protection dogs. They LOVE people.