Is There Really a Blood Test That Can Predict When You Might Die?

While watching The Doctors episode on Tuesday, January 31, 2017, one discussion was about a blood test that could possibly predict when you might die. Who would want to know when they might die? I, for one would not want to know when I might die. I would be dwelling on the fact. I think you are much better off not knowing this fact. Anyone agree? Or not?