The people who live the longest tend to cluster in five specific regions of the world: Okinawa, Japan; Sardinia, Italy; Ikaria, Greece; Nicoya, Costa Rica; and Loma Linda, California. These places, known as Blue Zones, have the highest concentrations of centenarians on the planet. What connects them isn’t genetics or geography but a remarkably consistent set of daily habits around food, movement, social connection, and purpose.
At the national level, Singapore and Japan lead the world in healthy life expectancy, with residents living roughly 73 to 74 years in full health according to 2021 WHO data. But the Blue Zones outperform even these national averages, offering a closer look at what individual lives look like when longevity is the norm rather than the exception.
Nine Habits the Longest-Lived People Share
Researchers from National Geographic and the National Institute on Aging studied all five Blue Zones and identified nine shared lifestyle characteristics, called the Power 9. None of them involve extreme diets, expensive supplements, or gym memberships. They’re woven into everyday life so seamlessly that residents don’t think of them as health interventions at all.
The nine traits are: constant natural movement throughout the day, a clear sense of purpose, daily routines for managing stress, stopping eating before feeling completely full, a plant-heavy diet, moderate alcohol consumption (in most zones), belonging to a faith-based community, putting family first, and maintaining close social circles. People who attended faith-based services four times per month added an estimated 4 to 14 years of life expectancy. Having a strong sense of purpose, called “ikigai” in Okinawa and “plan de vida” in Nicoya, was linked to as many as 7 extra years.
What the Longest-Lived People Eat
The traditional Okinawan diet is one of the most studied longevity diets in the world. It draws roughly 85% of its calories from carbohydrates and only about 9% from protein. That might surprise people used to hearing about high-protein diets, but the Okinawan staples are sweet potatoes, rice, vegetables, tofu, and small amounts of fish and pork. Across all Blue Zones, beans are the dietary cornerstone: fava beans in Sardinia, black beans in Nicoya, soybeans in Okinawa, lentils in Ikaria.
Meat is not absent, but it plays a minor role. Blue Zone residents eat pork or other meat roughly five times per month, in portions about the size of a deck of cards. The emphasis is overwhelmingly on plants, whole grains, and legumes.
In Loma Linda, where many residents are Seventh-day Adventists, about 53% of the longest-lived individuals follow some form of vegetarian diet. Vegans in this community reported the lowest rates of high blood pressure (about 17%) and high cholesterol (also about 17%), compared to non-vegetarians who reported hypertension at 34% and high cholesterol at nearly 30%. That said, the differences in serious heart events like angina were not statistically significant between dietary groups, suggesting that the overall pattern of eating matters more than strict labels.
One particularly notable habit comes from Okinawa: “hara hachi bu,” a Confucian practice of stopping eating when you feel about 80% full. Research from the NIH has found that eating less activates genes involved in energy production, DNA repair, and inflammation reduction at the cellular level. That 20% gap between satisfied and stuffed may be one of the simplest longevity tools available.
Movement Without Exercise
None of the world’s longest-lived populations are fitness enthusiasts in the modern sense. They don’t run marathons or lift weights. Instead, their environments keep them moving all day long. In Nicoya, daily life involves sweeping the porch, walking children to school, working on a farm, doing laundry by hand, and visiting family on foot. Walking is the primary form of transportation. There are few cars and few reasons to sit for extended stretches.
This pattern holds across every Blue Zone. Sardinian shepherds walk miles of hilly terrain daily. Okinawan elders garden well into their 90s. Ikarians navigate steep village paths. The common thread is that movement is constant, low-intensity, and built into the structure of life rather than scheduled as a separate activity.
Why Social Ties Add Years
In Okinawa, people form tight-knit social groups called “moai” early in life, sometimes in childhood, and maintain them for decades. These groups meet regularly, sometimes daily, to share meals, conversation, advice, and even financial support. Okinawan women live an average of eight years longer than American women, and their moai networks are considered a major contributor.
The flip side is telling: loneliness has been associated with a decrease in life expectancy of about eight years. People without close social ties face higher rates of heart disease, diabetes, depression, and stroke. Across all Blue Zones, the longest-lived people prioritize relationships. Sardinians gather for daily happy hours. Adventists build tight congregational communities. Ikarians socialize over afternoon naps and evening meals. The specific form varies, but the investment in human connection does not.
How Much Longevity Is Genetic
Earlier estimates suggested genetics accounted for only 20 to 25% of human lifespan, with some large family studies putting it as low as 6%. A more recent analysis published in Science reframed this question by separating deaths caused by external factors (accidents, infections, violence) from deaths caused by aging and disease. Once those external causes were excluded, the heritability of lifespan jumped to about 50%.
What this means practically is that your genes set a range, but your daily choices determine where you land within it. The Blue Zones illustrate this perfectly. These populations are genetically diverse: Japanese, Greek, Italian, Costa Rican, and a mix of ethnicities in California. They don’t share a gene pool. They share habits.
Why Some Countries Lead in Life Expectancy
Beyond the Blue Zones, entire countries achieve exceptional longevity through systemic advantages. Singapore leads the world with a healthy life expectancy of 73.6 years, followed closely by Japan at 73.4. South Korea, Iceland, and Luxembourg round out the top five, all above 71 years of healthy life.
Hong Kong offers an interesting case study in urban longevity. Despite extreme population density, the city achieves some of the world’s highest life expectancy figures. Researchers attribute this to very low infant mortality (1.7 per 1,000 live births), low smoking rates especially among women, few traffic-related deaths, and heavy public investment in healthcare. It demonstrates that longevity isn’t limited to rural villages with traditional lifestyles. Well-designed urban systems can achieve comparable results.
What the Longest-Lived People Do Differently
The clearest takeaway from studying the world’s longest-lived populations is that no single factor drives longevity. It’s the layering of multiple habits: eating mostly plants, moving throughout the day, maintaining deep social bonds, managing stress through simple rituals, eating moderate portions, and living with a sense of purpose. Each one contributes modestly on its own, but together they compound into dramatically longer, healthier lives.
The people who reach 100 in these communities are not outliers fighting against their environment. They’re ordinary people whose environments make the healthy choice the easy choice, every single day.