LZ: Population pyramids were the norm for all of human history. LZ: Now we're inverting the pyramid where a lot of us are going to be old and maybe semi coherent by 2050, 2060. The fastest growing demographic in the world right now is people over the age of 85; that's huge. If longevity scientists can figure out how to extend human life, populations might continue to grow for longer periods of time because we'll have people living for longer too.

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