Why does man die?

It is like a doctors waiting room : people come in, see the doctor, and leave : people are born, live life and die.

Theologically and metaphysically, no one can say for certain. Biologically, all living things age, and lose the ability to constantly replace their organ cells.

Yes, there is an end to all living organisms on the earth. All animals have to die eventually.

If you do not die from illness, accident, deliberate fault or whatever, you will die from old age. Scientists have not found how to make us live forever yet. If they did then the world would over populate in no time. It is a natural process to live and die.