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What is the number one habit for healthy aging National Geographic?

According to extensive research, including explorations by *National Geographic*, genetics only account for about 20% of human longevity, leaving 80% to lifestyle and environmental factors. This shift in focus highlights the power of our choices, raising the question: **What is the number one habit for healthy aging National Geographic** highlights? The answer isn't a single secret, but a cornerstone of physical activity that influences nearly every aspect of health.