Howard Tucker, the American neurologist recognized by Guinness World Records as the oldest practicing physician in history, shared three principles for longevity in an essay published posthumously by CNBC Make It with his family's permission. Tucker died on December 22, 2025, at the age of 103.
Tucker practiced neurology for more than 75 years, continuing until his hospital closed in 2022, after which he worked in medical-legal consulting.
He said the secret to a long life was not a single universal formula, acknowledging that genetics and luck play a role, but he named three habits accessible to nearly anyone.
Keep the mind active
First was constant mental activity. Tucker compared the brain to a muscle that gradually loses ability without regular use, and advised learning new skills, reading, and volunteering. He enrolled in law school around age 60 and obtained a law license at 67.
Let go of grudges
Second, Tucker urged rejecting hatred and lingering resentment, warning that anger raises stress levels and the risk of cardiovascular disease. He advised focusing instead on people and pursuits that bring meaning.
Practice moderation
Third, he advocated moderation rather than giving up favorite foods or pleasures entirely, arguing that balance sustains health and enjoyment over the long term.
Tucker closed his final essay by urging readers to keep their minds sharp, release bitterness, and enjoy life, describing each day as a chance to live well.
