How has the human life span changed over time?
In the last 200 years, one year of extra lifespan has been added for about every four years of historical time. Life expectancy has doubled since the industrial revolution, from about 40 years to near 80 years. The same factors that increased lifespan in modern times were also responsible for increasing human lifespans in evolution. Life expectancy doubled from 20 years in our great ape ancestors, to 40 years, which was the general human life expectancy before the modern era. Why are humans living so much longer now than ever before? Aging processes in humans are directly related to the nutritional and inflammatory aspects of the environment. One example is Alzheimer’s disease: Research from our lab has shown that the senile plaques that build up in that disease are related to inflammatory processes in the brain. And we now know that inflammation intensifies atherosclerosis, the hardening of the arteries that can contribute to stroke and heart attack. Longer life spans have been a worl
