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' (opens in new tab)

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.