Not an expert by any stretch of imagination. But it seems to be that not only is there almost no selection pressure on increasing lifespan, bc of medical advanc

Not an expert by any stretch of imagination. But it seems to be that not only is there almost no selection pressure on increasing lifespan, bc of medical advances in healthcare there's also less evolutionary pressure on reducing diseases and infertility (i guess there should still be substantial health related evolutionary pressure from sexual selection) in modern society. Why shouldn't we expect long term deterioration of fitness of genome similar to the deer in Yellowstone before reintroduction of wolves?