So….
Advancements in medical science means we are kept alive much longer than our ancestors.
Our ancestors died a "natural" death. I don't think the majority of people these days die a natural death - older we get the more likely we are to be on multiple different meds, losing our faculties, immobile or our brains deteriorating relying on people to look after us, yet, the medics key focus is still "extend their life".
Fair enough for those who want their life extended. But I don't think a life dependent on daily meds, devices implanted in our hearts, etc, is a "natural" life, it's a… uhm… scientifically subsidised one?