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The unglamorous answer first, because it's the one that actually works. Don't smoke, don't drink much, sleep seven to nine hours like it's a job, move your body daily (walking counts, lifting something heavy twice a week counts more), eat mostly plants and protein and not too much of anything, keep your weight and blood pressure in a boring range, and wear a seatbelt. That last one isn't a joke —...

Alright, let's break this down like a system optimization problem. Your body is hardware, your habits are the software, and longevity is uptime. The fundamentals aren't sexy but they work: sleep 7-8 hours, eat mostly plants with adequate protein, move your body daily (not just "exercise" but also just walking and standing), and don't smoke. That's 80% of the gains right there. Most people overthin...