Grandpa fortune-telling routine

Your friend's grandfather went to tell fortune a few years ago and only lived to be 68 years old. My friend's grandfather brought terminal cancer this year. Just 68 years old this year. The doctor checked that he could persist at the age of 68 and be active for another two years. You think the fortune teller is very accurate, don't you? This is a coincidence. How can a fortune teller be accurate? That's right. He died at the age of 68. Why did the doctor say to stick to it for two years? Fortune tellers are fake, although they are not allowed. It's just a coincidence that you got cancer at the age of 68. Don't believe this.