I have rich older relatives and they essentially do this already. It has, unquestionably, added years to their lives. Scaling it to >90% of the population will be the work of the next 30 years, but the tech is there. The money isn't, yet.First, everyone who is alive (or at least over 90% of the population) will have high quality, regularly scheduled medical attention. Basically a yearly checkup for everybody, take basic vitals, in addition to some blood, and a few other samples. These massive, population-based samples get screened for everything. Take every number and fact that can be squeezed out of those samples, and combine it with their personal history (Socioeconomic status, family status, intelligence by some measure, level of education, level of parents education, list goes on), to create a biological model of the entire human population.