Why Does Aging make Sense

We are genetically programmed to grow, we are also genetically programmed to age… and die. Why is this the case? As much as I hate knowing that I am programmed to age and die (I´ve grown already) I can see how death is essential for evolution. Death, whether we like it or not, is the measure of our evolutionary success. If evolution is the survival of the fittest, timing of death is the metrics of survival or non survival. If a specie was evolved in a way that it´s individuals lived forever, then how could we know who the fittest individual is?

• death
• human being
• nature