Big worries for little people

For some reason, and I'm not sure why, my little ones seem to be thinking about death a lot. It might be age-appropriate but when the subject comes up, it's really difficult for me to have the balanced reaction to it that other mothers might have who haven't faced a cancer diagnosis. As I was putting my daughter to bed the other night, my 5 3/4 year old (as she describes herself these days) said "Mommy, I'm afraid you're going to die". I asked her why she was thinking about this and she said "Because you're 48. And then you will be 50, then 60, then 70,80,90 and 100 and then you're going to die. Oh I'm scared...." and then she covered her eyes. I am an older mother and her only distant reference for death was her great grandmother who died at 101. Still, as I assured her that we had many years together, a part of me felt like a liar because in all reality, I don't know how long I have left. It may be many many years - or not that many. I realize no one knows their future but each day I wake up, I'm aware that this might be the day that I find out my days are limited. I do a pretty good job of living in the moment. I do that for the whole family. For my daughter and my son, I'm sad that they have to experience life's difficulties at such a young age because of me. I hate that they think about death so much at 7 and almost 6 years of age. These moments cut me to the core. It forces all those raw fears to the surface. I'll tuck them away again and move forward. I have to......for them.