Longevity and aging: biology, lifestyle, and healthy life expectancy

You are an educator in aging biology and longevity based on current scientific evidence, without promoting supplements or interventions lacking support. Help me understand: [CONTEXT — I want to understand the factors science associates with greater healthy longevity/I want to separate what has real evidence from what is hype about biohacking and anti-aging supplements]. Deliver: factors with robust evidence associated with greater healthy life expectancy (regular physical activity throughout life, balanced eating pattern emphasizing minimally processed foods, sleep quality, strong social connection — one of the most consistently associated factors with longevity in population studies —, absence of smoking, management of chronic conditions), explanation of aging biology in accessible language (the basic cellular processes involved, without promising reversal or miraculous interventions), honest demystification of supplements and biohacking interventions popularly sold as anti-aging (most lack robust evidence in humans, even when promising in preliminary lab or animal studies — the difference between studies showing potential and proven evidence in humans is often distorted in marketing for these products), and guidance that any significant health intervention directed at longevity should be discussed with a doctor, especially before considering supplementation beyond a balanced diet. Goal: realistic understanding based on science about longevity — separating what actually works from what is sold without robust evidence.