Living past 100 does not require magic potions or futuristic science; Dr John Scharffenberg proves it with simple daily habits. At 101, this Harvard-trained physician is still actively sharing what he calls the very simple, very human secrets to longevity. His approach is not about chasing immortality but about maintaining a body and mind that allow you to enjoy your years—whether you are at 30, 60, or, in his case, well past a century.Exercise Like Your Life Depends On It Dr Scharffenberg insists exercise is not just a nice-to-have; it is non-negotiable. He puts it bluntly: a woman who is overweight but exercises daily will outlive a lean woman who avoids movement. That is how powerful regular activity is.What is more, he stresses that midlife is the most crucial time to stay active. Consistent exercise during those years does not just help with weight; it may reduce the risk of Alzheimer’s and slow down other age-related declines.Even at 101, the doctor has not hung up his walking shoes. While he no longer pushes himself through intense workouts, he makes sure to walk daily, recommending seniors aim for at least two miles a day. Walking, he says, builds muscle strength, maintains independence, and could even add hours to your lifespan for every hour you put in.Eat Like An AdventistAs a Seventh-Day Adventist living in Loma Linda, California—one of the world’s rare “blue zones” where centenarians thrive—Dr Scharffenberg follows a largely vegetarian diet. And it is not a trend. Research shows Adventists live longer than the average American, with vegetarians among them adding up to two extra years on average.The Adventist kitchen is built around five food groups that Scharffenberg swears by:Legumes like beans, lentils, and chickpeas are rich in protein and fibre.Whole grains such as barley, brown rice, and oats are proven to cut the risk of heart disease and diabetes.Nuts, which may reduce heart attack risk by as much as half—though he warns portion control is key.Fruits and vegetables, an obvious but essential pillar for lowering disease risk.Soy, which he personally recommends, particularly tofu, for its protein and protective compounds.He also has a soft spot for mangoes, praising them not just for their taste but also for their brain-boosting vitamin B6 and antioxidants that protect eyesight and may even reduce cancer risks.Vitamins You Are Probably MissingOne of Dr Scharffenberg’s biggest concerns is how many people, even those who think they eat well, are quietly deficient in crucial vitamins. He points out three that are often lacking, especially in older adults:Vitamin A: Almost half of Americans do not get enough. Without it, your immune system weakens, your eyes suffer, and your risk of infections skyrockets. Instead of popping pills, Scharffenberg recommends foods high in beta-carotene like carrots, sweet potatoes, cantaloupe, and dark leafy greens, which convert into vitamin A naturally and safely.Vitamin B12: Age makes it harder for the body to absorb this nutrient, even if you eat meat. After 50, many lose the ability to produce the stomach factor needed for absorption. For vegetarians and older adults, he recommends supplements as the most reliable way to maintain healthy levels.Vitamin D: Here, the numbers are alarming. Dr Scharffenberg says that up to 95 per cent of Americans may be deficient. The “sunshine vitamin” is critical for strong bones, calcium absorption, and possibly even cancer prevention. But depending on where you live, especially in northern regions, sunlight might not be enough. If you cannot get daily sun exposure, take a supplement to safeguard your long-term health.No Shortcuts, Just Simple ChoicesDr Scharffenberg has seen health fads come and go, some with more harm than good. His philosophy is almost shockingly ordinary: eat mostly plants, stay active, avoid smoking and alcohol, and keep an eye on vitamins that silently decline with age. He believes these basics do not just add years to your life but add life to your years, keeping both body and brain in shape.In his words, you do not need miracle cures. You need to walk, to eat beans and greens, and to give your body the nutrients it quietly depends on. It’s the steady choices, repeated daily, that build the foundation of longevity.The Centenarian’s PrescriptionAs people look for high-tech hacks to outsmart ageing, Dr Scharffenberg embodies a simpler truth: living long and well is not about beating biology; it is about working with it. His century-long experiment in health proves that small, consistent habits can outpace even the best modern medicine.