A lot of people want to know the answer to this question. First of all, I’d like you to make sure you know exactly why you might not get treatment. If the doctor recommends it and you can afford it, get it. If someone is very old and that is the problem, it’s really hard to say. Men in their 80’s and 90’s often have prostate cancer and die of something else. It’s impossible to get reliable statistics on this question because people get different forms of the disease at different ages. They also get it diagnosed at different times and have different emotional responses to it. If you try to eat well, exercise, and remain mentally positive, it could add years, but really consider getting treatment asap if you are able to do it. If you really can’t or won’t, don’t give up. Some people have been known to miraculously get rid of cancer. Look into treatment first and then rely on faith.