Telomere & Cellular Aging Simulator

Telomere & Cellular Aging

Division rate 1.0×

Telomerase activation 10%

Protective interventions 10%

Telomere length

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Replicative age

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Senescent cells

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Colony divisions

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How it works

Every time a cell divides, DNA polymerase cannot fully copy the very end of each chromosome — the "end-replication problem" — so the protective telomere cap shortens a little each round. The large rotating model shows this directly: its four telomere caps shrink as the colony's average telomere length falls. Telomerase, an enzyme active mainly in stem and cancer cells, can rebuild part of that lost sequence; most adult cells have little or none of it. Once a cell's telomeres erode past a critical length it stops dividing for good and becomes senescent — the Hayflick limit — and starts secreting inflammatory signals (SASP) instead. Protective interventions such as antioxidants reduce the oxidative damage that accelerates shortening, and senolytic-style clearance periodically removes senescent cells from the colony, echoing real senolytic drugs like dasatinib + quercetin.

ΔL = −(1 − telomerase)·k_loss + telomerase·k_regen + noise
cell → senescent  when  L ≤ L_critical   (Hayflick limit)
clearance: senescent fraction thinned each round ∝ protection

Division rate — how fast simulated time passes; higher values age the colony through many replicative cycles quickly.
Telomerase activation — the fraction of each division's telomere loss that gets rebuilt; near 100% keeps cells replicating almost indefinitely, mimicking stem/cancer cells.
Protective interventions — combined antioxidant + senolytic effect: it dampens random oxidative damage per division and gradually clears a share of already-senescent cells from the dish.
Reset (the “Divisions” toggle plus reload) — start a fresh colony at full telomere length and replicative age zero.

Real-world relevance: this loop is the mechanism behind the "hallmarks of aging" — telomere attrition and cellular senescence — that longevity research (senolytics, partial epigenetic reprogramming, rapamycin, caloric restriction) is trying to slow or reverse.

Healthy — long telomeres Healthy — shortening Near Hayflick limit Senescent

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