If no one knows when a person is going to die, how can we say he died prematurely?

It is perfectly certain that all diseases without exception are preventible, or if not so that they can be so weakened as to do no harm. It is perfectly certain that all accidents are preventible; there is not one that does not arise from folly or. negligence. All accidents are crimes. It is perfectly certain that all human beings are capable of physical happiness. It is absolutely incontrovertible that the ideal shape of the human being is attainable to the exclusion of deformities. It is incontrovertible that there is no necessity for any man to die but of old age, and that if death cannot be prevented life can be prolonged far beyond the farthest now known. It is incontrovertible that at the present time no one ever dies of old age. Not one single person ever dies of old age, or of natural causes, for there is no such thing as a natural cause of death. They die of disease or weakness which is the result of disease, either in themselves or in their ancestors. No such thing as old age is known to us. We do not even know what old age would be like, because no one ever lives to it.

Some people eventually die at 80 but the Truth is, they have been dead since they were in their 30s”

How young can you die of old age?

To die of age is a rare, singular, and extraordinary death,

Death? Since when is death failure?

Some people have insisted that this life is a kind of school for the production of self-denying men and women—that is, for the production of character. The statistics show that a large majority die under five years of age. What would we think of a schoolmaster who killed the most of his pupils the first day? If this doctrine is true, and if manhood cannot be produced in heaven, those who die in childhood are infinitely unfortunate.

Most people die at 25 and aren’t buried until they’re 75.

We are held back by too much caution. We are timid about venturing. We are not bold enough. And so we die before we reach middle age, although we will not be lowered into the ground until we pass three score and ten.

In heaven so wonderful Why are we oh so afraid of dying young We are dying young

Consider the fact that, in a few years, I shall be dead. This fact can seem depressing. But the reality is only this. After a certain time, none of the thoughts and experiences that occur will be directly causally related to this brain, or be connected in certain ways to these present experiences. That is all this fact involves. And, in that description, my death seems to disappear.

It is helpful to recall that the death of the person is a single event, consisting in the total disintegration of that unitary and integrated whole that is the personal self. The death of the person, understood in this primary sense, is an event which no scientific technique or empirical method can identify directly. Human experience shows that once death occurs certain biological signs inevitably follow, which medicine has learnt to recognize with increasing precision. In this sense, the "criteria" for ascertaining death used by medicine today should not be understood as the technical-scientific determination of the exact moment of a person's death, but as a scientifically secure means of identifying the biological signs that a person has indeed died.

“Death,” the philosopher Ludwig Wittgenstein once wrote, “is not an event in life.” He meant, maybe (for it’s hard to be sure—Wittgenstein was rather titanically cryptic), that being dead is not something we actually experience and that since we aren’t conscious of a nonliving state it is literally meaningless, so instead of spending our lives worrying about the future we should look at each instant as an eternity. We should live in the moment.
Perhaps this is true, and wise, but in an ordinary sense Wittgenstein was completely wrong. Death is the event in life. It is our chief organizing principle. It’s why we rush and why we dawdle, why we better up our bosses and fawn over our children, why we like both fast cars and fading flowers, why we write poetry, why sex thrills us. It’s why we wonder why we are here.

To die; to decide to die; that's much easier for an adolescent than for an adult. What? Doesn't death strip an adolescent of a far larger portion of future? Certainly it does, but for a young person, the future is a remote, abstract, unreal thing he doesn't really believe in.