Ooh, deep one. If I know I can't avert either, I'd want to know when, I think. If I knew how, I'd be terrified of that thing for the rest of my life. If I know when, it might suck when it gets close to it but I can at least plan ahead and map out my life accordingly*.
*although it does lead to a significant issue which is that if I HAVE to die at a certain point and no later or sooner, I'd be de facto immortal until then, which might rather affect my life planning...
Blinds or curtains?