Just watched a brilliant interview with a medical doctor who is hugely knowledgeable about natural selection.
For every 100 females that die at 20, 300 males die in that same age group. As shocking as that sounds this guy gives a great explanation for what causes it.
Worth watching the whole thing - he explains what evolution has done ''wrong'' in the body. Though thought this part would be of particular interest to posters here.
Perhaps if everyone knew about this there would be more effort put into increasing male lifespan or perhaps the opposite; the attitude may be that its genetics and theres not much we can do about it without discriminating against women.