Death and Eternal Survival of the Body
A man is born to live and die.
But a man is not expected to be afraid of his death all the time, though he cannot get rid of this fate. He is expected live with all his heart and all his ability. Death is beyond his capacity. He cannot conquer death.
No matter how advanced the medical science will be, he cannot evade death. If all the aging parts of his body, including cells and neurons in the brain, can be replaced with new ones produced using some advanced biological technique, his spiritual entity must be lost and his personality and his self-consciousness must be vanished.
Indeed death is extinction of one's consciousness. If his body could live forever through a parts-replacing technology, his consciousness must be lost at a certain point of the process of renewal of his brain cells.
New International Version
Matthew 6
25“Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more than food, and the body more than clothes? 26Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? 27Can any one of you by worrying add a single hour to your lifee ?
King James Bible
Matthew 6
25Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment? 26Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they? 27Which of you by taking thought can add one cubit unto his stature?
Probably not only each man but also the whole mankind cannot add a single hour to their life or become taller like a giraffe.
Probably our mind under restrictions of physical conditions is not perfect. It must leave the body to be perfect. However, we are not expected as soon as possible to die for this purpose. We are created to live our life with all of our mind and might to make our mind grow enough according to a criterion each individual is given by God.
Our death is so meaningless before God who is expected to save our soul.
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Rev 12:13 And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child.
Rev 12:14 And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent.
Rev 12:15 And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away of the flood.