Once you get to the 50 year olds it starts to get a bit dangerous. I know this from experience. My father knew a friend and his wife who were 52/54, and both of them died. It's not like they were poor and didn't have money for treatment, they were engineers, who of course make quite a large salary. My parents are already in a dangerous spot, but so are my aunts, uncles, and especially grandparents. 50 year olds can and do have some young kids, who would almost definitely survive, but they would spread to the parents and it becomes a greater gamble there. When my fathers friends died, their kids had to go live with their GRANDPARENTS.