Figure 2. The problem of absolute compression of morbidity concept.

See Figure 1A for symbol explanation. M morbidity span. (A) Initial lifespan. An untreated animal. (B) Anti-aging intervention. Morbidity span is constant, healthspan and lifespan are expanded. So, morbidity “compressed” only relatively, not absolutely. (C, D) Fictional. Lifespan is kept constant, regardless of healthspan extension. A progressively expanded healthspan, with constant lifespan, is bound to absurd.