George Bernard Shaw commented on how ridiculous it is that just as we are reaching the age at which we begin to acquire some wisdom, our faculties start to deteriorate and our bodies let us down. So, when we should be applying our hard-won experience to solving the problems of human conflict, overpopulation, and the degradation of our planet, we spend a disproportionate amount of our remaining lifespan worrying about our failing health and memory.

How different our lives could be if we lived twice as long and retained full possession of our health and senses, and no one would have to retire unless they wished to. (For some ideas on how to do this, see article here.) A doubling of current average life expectancy to 160 years does not imply that everyone will live that long. There will still be attrition due to accidents and disease, with many...

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