How do we prepare mentally and emotionally?
I'm not afraid of death. I don't think about it much, but I'm only 66; closer than I've ever been, but not as close as I will be going forward.
I'm not worried about who will be left behind, except for my foster nephew, formerly my foster son. He's only 3. I'm very much involved in his life, and he needs me in it. I hope I stay until he's old enough to know what death is. My wife understands that she will likely outlive me, but she'll be all set, so no worries there, either.
Everyone else - kids and grandkids - are grown or old enough that I'm not needed.