This is not a prediction of your lifespan
No model can forecast an individual's lifespan from interventions — the human outcome data mostly does not exist. This tool illustrates the direction and relative weight of evidence as ranges. Treat every number as a teaching estimate, not a clinical result.
Framing inputs
These are used only to frame the illustration. Nothing is stored, and nothing is transmitted anywhere — the model runs entirely in your browser.
How this is calculated (read this)
Step 1 — a range per intervention
Each intervention gets a range of plausible added healthspan years from its evidence tier: Level A gives 1.0–3.0 years, Level B gives 0.3–1.5, Level C gives 0.0–1.0. So better-documented entries simply count for more.
Step 2 — fundamentals carry more weight
Five fundamentals override the tier default because their human evidence is unusually deep: cardiorespiratory fitness (2.5–5.5), resistance training (1.2–3.0), the Mediterranean pattern (1.0–3.0), sleep optimization (0.8–2.5) and caloric restriction (1.0–3.0).
Step 3 — overlap discount
The low ends are summed, the high ends are summed, and both are multiplied by 0.92^(n−1) where n is the number selected. Stacked interventions share biological mechanisms, so they do not simply add up.
What this is not
Not a diagnosis. Not a personalized prognosis. Not a substitute for clinical judgment. It cannot tell you what will happen to you.
The largest honest gains come from the fundamentals — fitness, muscle, sleep, diet and cardiovascular risk control. That is exactly why they carry the heaviest bars here, and why the exotic entries carry thin ones.