Biological Age & Lifespan Simulator

Lifestyle Inputs

Diet quality 50

Exercise level 50

Sleep quality 50

Preventive screening adherence 50

Readouts

Chronological age

40 yr

Biological age

40.0 yr

Projected lifespan (Gompertz model)

84.6 yr

Organ Systems

How it works

Five organ systems (cardiovascular, metabolic, pulmonary, renal, immune) each carry a health score H_i ∈ [0,100]. Every simulated year, each score relaxes exponentially toward a lifestyle- and age-determined equilibrium:

Eq_i(age) = clamp( 100 − 0.7·r_i·(age−20)
                     + 0.4·w_diet,i·(diet−50)
                     + 0.4·w_ex,i·(exercise−50)
                     + 0.3·w_sleep,i·(sleep−50)
                     + 0.25·w_scr,i·(screening−50), 0, 100 )
H_i(t+1) = H_i(t) + (Eq_i − H_i(t))·(1 − e^(−k_i))

r_i is the organ's intrinsic aging-decay rate and w_·,i its sensitivity to each lifestyle factor — cardiovascular and metabolic systems respond most to diet and exercise, immune function most to sleep and screening. Composite vitality is the unweighted mean of the five H_i.

Because the population-average equilibrium (all sliders at 50) is linear in age, biological age is the age at which the neutral-lifestyle curve would predict your actual composite score — a simplified version of the regression-based biological-age estimators (Klemera–Doubal, PhenoAge) used in aging research:

bioAge = 20 + (100 − composite) / (0.7·mean(r_i))

Projected lifespan integrates a Gompertz–Makeham mortality hazard μ(a) = A + B·e^(c·a) forward from the current biological age, summing year-by-year survival probability S(a) = e^(−∫μ) to get expected remaining years — the same functional form demographers use to fit real human mortality curves.

Sliders — set the lifestyle inputs that define each organ's target equilibrium.
Simulate 1 Year — advances chronological age by one year and lets every organ relax toward its new equilibrium.
Auto ▶ — advances one year automatically every second until stopped.

Healthy (≥70) Moderate (40–70) At risk (<40)

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