At 103 years old, I’m the ‘world’s oldest doctor’: My 3 rules for a long, happy life are so simple—I tell it to 'all my patients'

Dr. Howard Tucker left behind an impressive legacy. At 103, he was named the oldest doctor in the world — and quite possibly the happiest. Shortly before passing away, he shared his rules for living a long, happy and healthy life. They're very simple, he says.