Imagine a new “fountain of youth” pill – it doesn’t make you immortal, but it does drastically cut your death rate, to that of an ordinary thirty year old. Nanobots maybe. Imagine also that this pill’s required dosage increases about as fast as mortality does today, doubling every decade. So getting that fountain of youth effect requires twice the dosage at fifty as at forty, and twice again at sixty. (Below-dosage use has little benefit.) What would such a pill do to our medical systems?