Not to mention the fact that even if it works in removing some ageing factors, most of your cohort still probably ends up running into the sort of ailments that

Not to mention the fact that even if it works in removing some ageing factors, most of your cohort still probably ends up running into the sort of ailments that terminate most people's lives before the theoretical limit to their lifespan. And those other ailments represent challenging, but more easily testable medical problems to solve first