well. if they were able to make people live for 800 years that would probably mean they could change how people age with time and maybe after a hundred years the person would still be fit for exercise and be as immune as everybody else against diseases. and if not. then it would be plain horrible. there would be like 1/10th of the population unable to work. and 1/10th to take care of the 9/10th. disaster.
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