Facing My Mortality

I'm 25 years old. I've lost two grandparents and known many other people who passed away -- strokes, accidents, diseases which won in less time than expected. But I've never considered my own mortality. Why would I? I'm young and healthy and I live in the first world, so even though I'm basically below the poverty line, I'm still vaccinated to the hilt. There's not an awful lot I have to worry about dying from.

I have promised another human being that one of us will be the one to bury the other.

This is the closest I've ever come to really understanding that one day I will die.