When speaking to his older friends, Dr. Garth mentions that humanity had only been able to increase life expectancy by maybe 15 years in the past fifty years of modern science. His friends counter that human lifespan is meant to only be 70 years ("three score and ten"). Both statements are incorrect. Life expectancy in the US was more like 60 (men) and 65 (women) in 1940, up from life expectancy around 40 in 1890. However, data was spotty before 1900, and life expectancy in the early 1900s was closer to 50, which may have been more what Dr Garth was referring to, he was just hyperbolic about the time frame.
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