I am 70 and like most of you feel that time flies past so fast now, and that at best there are only 20 or so years left.
Now and again, the thought of loosing DH crosses my mind, and I push it away from me, as thankfully, as yet, neither of us is ill. The thought that he might have to live through my death, rather than I having to loose him frightens me far more.
I know he would find it unbearable, and I doubt I would be able to prepare him in any helpful way. However, what is to be, will be and it does no good to worry unnecessarily.
That said, I have made my will and left a list, that I update when necessary regarding financial matters etc, so whoever has to deal with the aftermath of my or our deaths isn't left totally in the lurch.
I am determined to enjoy life as fully and as long as possible. I know we all have to die one day, and I hope and pray that getting to that point will not be a long, painful experience.