Everyone has a duty to die, eternal life is not a possibilty for us today given our circumstances. The facts are that we do not have enough resources to support everyone, even today, an era where living forever is not an option, we still having millions of people starving everyday. If you consider that we have millions of starving people now, could you imagine how many people would be starving if people didn't die from old age?
The strain on our Earth would become un-barable, in our current system the elders must die to provide others with a chance of survival.
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