Dr. Harkins has been taking care of me for close to 40 year

Dr. Harkins has been taking care of me for close to 40 years, and also took care of my father for his last 20 years, and he lived to be 99 years old. I know that I'm not the best patient, but he has never said anything to correct. He had coolest temperament, even though I don't deserve his professionalism. I have several relatives that he treats, and all agree with my assessment.