For as long as one entertains the notion that one life is all there is, death certainly becomes hard to reconcile.(By way of reminder, the following is in reference to my early life experience with a family that lost 3 children to a congenital birth defect. Each of the boys wasted away for several years, in such suffering that could only be characterized as cruel, if you actually believe God chose for this to happen to them -- particularly if you are a Fundamentalist who thinks God visits the sins of the parents upon the children. The parents were saintly people who could not remotely be categorized as sinners whose sons needed to be tortured and killed to teach them a lesson.)
Otherwise death doesn't really present an issue regardless whether one is 1 minute or 101 years old
On the contrary, its certainly hard for a conditioned living entity to understand that they (or anyone else for that matter) are not the bodyIt must have been hard for ancient societies to accept that bad things could happen to them without cause. In the course of their development of superstitious explanations for suffering, sickness, injury and death, they must have come up with a pool of inexplicable causes which they tied up in a bundle and called God.
Like you say, life is a crap shoot, whether you talk about the biological processes that randomly mix to form gametes, and the subsequent randomness of fertilization, to the random way things can go wrong in the embryonic development, and from there all of the random ways infection and injury can ravage, maim, torture and kill individuals.
It would be easier to hold the Enlightenment view of the Deists, that there is a God who merely created the Universe, but who does not hang around after creation to mess with his little Frankensteins, wreaking havoc on them for arbitrary, unjust, angry and envious reasons.
The reason not to believe in God is not just that the model of God interfering with reality is so absurd. The reason is that all ideas of God stem from superstition.