Why do some people arrive at eighty with sharp minds, resilient bodies, and deep connections - while others deteriorate slowly through their fifties and sixties, long before their hearts stop? The answer is not primarily genetic. It emerges from four interconnected biological systems - stress physiology, sleep architecture, social neuroscience, and psychological resilience - that reinforce or undermine one another across a lifetime. The 100-Year Mind maps these systems with scientific precision and explains them in language that earns your trust. You will learn why chronic stress accumulates as measurable biological debt, why a single night of poor sleep measurably increases your brain's amyloid burden, why social isolation is physiologically equivalent to smoking fifteen cigarettes a day, and why the prefrontal cortex - your most powerful regulatory tool - is specifically degraded by every lifestyle factor most people ignore. Each chapter builds on a foundation of peer-reviewed evidence, teaches you the mechanism behind the claim, and delivers a PDCA-based protocol you can measure and iterate. This is not a book of prescriptions. It is a book of mechanisms - because understanding why something works is the only thing that sustains behaviour change across decades. The goal is not a longer life at any cost. It is a century-long life worth living: defined by cognitive sharpness, emotional depth, physical capability, and the kind of connectedness that makes every decade feel like a privilege.
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