Presumably some sort of cellular rejuvenation - perhaps a way of gradually replacing senescent cells with healthy cells and/or of activating telomerase without

Presumably some sort of cellular rejuvenation - perhaps a way of gradually replacing senescent cells with healthy cells and/or of activating telomerase without causing cancer - would have beneficial effects across your entire body. There are already large mammals - bowhead whales - that can live 200 years. Perhaps we can adopt some of their longevity traits without having to become giant ocean creatures.