You are assigning intentionality to these mechanisms, but as the other commenter pointed out a much simpler way to view it is that death and senescence are just side effects, not actual mechanisms with evolutionary purposes. Organisms get born and need to reproduce, that's the mandate. There is no evolutionary pressure for you to die, so obviously DNA does not have organismal death programmed in, it has cell death which is necessary for organisms to live long enough to reproduce. Many of the things that are optimal for you to reproduce might not be optimal for you to survive a thousand years, and what happens to organisms outside their reproductive cycle is pretty much irrelevant to natural selection.
replyan organisms behavior outside of reproduction certainly can have an impact on natural selection. the vast majority of ants cannot reproduce by your logic their behavior shouldn't have any impact on natural selection. if a non-reproducing members behavior impacts those who can reproduce it will have an impact on natural selection.
reply> There is no evolutionary pressure for you to die
reply> what happens to organisms outside their reproductive cycle is pretty much irrelevant to natural selection
Certainly seems plausible for that to create evolutionary pressure: why have organisms still consuming resources if they're no longer contributing to reproduction / natural selection?