Have you ever died? Of course not.
What if, your consciousness has shifted timelines every single time an event occurs that will kill you?
Eventually, you're going to grow old and frail. But instead of dying, your timeline will keep shifting to increasingly improbably realities where you keep on living. You'll live until you're bed-ridden and 125 years old, breathing through a ventilator and in constant pain. But you will not die.
Your brain will lose all coherence and your organs will rot inside you. But you will not die.
You'll live on and on and on. Every single time you take a breath, in every other timeline you would die. But your consciousness switches to the timeline where you get to take another painful, gasping breath. Each time your rotting heart would give out, you switch to the timeline where it beats again.
And you never die.
You'll just be trapped in a rotting carcass, somehow still alive, like the God-Emperor. Your rotting brain forgets everything yet is still able to feel pain.