One can just sleep and not waking up forever. For no reason.
And one can just suddenly collapse and pass away without showing any prior signs of bad health or anything similar to it.
So are all these determined by the telomeres in every single cell in our body? I doubt the accuracy of the fact.
Perhaps when you really take some time to sit down and contemplate a little, life isn't really that simple and in fact, it is much more complex than you could imagine. It's just as complicated as the brain. Plus, life has one more characteristic - unpredictable.
No one can tell exactly what will happen next in their life.