Life expectancy calculator
A crude population estimate, not a prediction about you. It ignores genetics, medical history, income, location and chance — all of which matter more than most of the factors above. It is not medical advice.
Average life expectancy in wealthy countries is around 79 for men and 83 for women. Lifestyle factors shift it substantially: heavy smoking removes about a decade, regular exercise adds a couple of years, and obesity removes about four.
How to read this estimate
Smoking dominates every other modifiable factor by a wide margin. The adjustment here — around ten years for heavy smoking — is consistent with the large cohort studies, and no combination of the other factors comes close to offsetting it. What the calculation cannot include is what actually varies most between individuals: genetics, existing conditions, income, and simple chance. Anyone taking a number like this seriously as a personal forecast is over-reading it considerably.
Questions
Not very, as a personal prediction. It applies population averages and cannot see your genetics or medical history.