Actually, I was just about to post about this, so thanks for the springboard to get into it.

Just because we have seen many other people die, just because we know people have died in the past... 

Is not 100% proof that any of us who are alive right now, will die. 

I am not even talking transhumanist shit.

It could be spiritual, or part of a simulation. 

The truth of the matter is: Nobody alive today has any guarantees they will die. We only have FAITH it's a guarantee, because "Everyone dies, that's what we've seen so far".