the earliest creative humans lived to around 40 or so, and the jump in lifespan from then to now has taken thousands of years; why should a little longer take only one generation?
Actually the jump in lifespan took only about one and a half century
In nineteen century people lived about 40 years (average).
Now we live longer because of progress in medicine. We have drugs, antibiotics, and all different types of chemicals which help us fight diseases.
Maybe further advancement, now in genetic engineering, organ cloning and transplantology may increase our lifespan even more
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