First, congratulations for the website.
I'll try to phrase my question in an intelligible way:
How do we realise, if we ever really do, that we are mortal? Indeed, until we are dead, at which point we are not conscious anymore, we have no affirmative knowledge of the fact that we are mortal.
Is it an inferrence made from our observation of the world, and of the idea that we are no different?
Or is it something that is culturally acquired by social influences - in which case I should maybe seek answers from social anthropologists?
Could then it be considered more of a presumption than a realisation? And yet it is holds such a grip on people that it would be hard to suppose it is a mere presumption.