That assumes that maximum life expectancy would stay the same if you could live that maximum life with greater health. If there is a mechanism in our bodies th

That assumes that maximum life expectancy would stay the same if you could live that maximum life with greater health. If there is a mechanism in our bodies that creates an artificial maximum of life, like a telomere - then you would be right. It also could be possible that avoiding the frailty of age means the avoidance of death. Stay healthy and you stay alive.