The days when 60 was old have long gone.
I think what matters is how old the child is likely to be when there oldest parent dies.
I know that sudden and, not so sudden deaths, happen at all ages, my grandfather died when my mother was 6, so did my DDiL's father, but, setting that aside. I do think it very selfish of men to start fathering children in their 80s and 90s, they may, if all goes well still be alive when their children reach their teens, but it is more likely, that they will not and that for yars before that they maay be in poor health or develop dementia and need as much if not more care than their children. Children losing their father when they are still so young are going to have very few memeories of their father to carry them through.