In the conference, Marc Thouvenin talks about Jandalhis great-great-great grandfather, who lived 10,000 years ago. At that time, before agriculture, humans were hunter-gatherers. They walked 23 km/day on average. Sometimes they would run for a few minutes to catch a rabbit or escape from a lion. And finally, as they could not always find food, they fasted regularly.
Their life expectancy at birth was only 40 years, but their life expectancy at age 45 was 20 years, a typical life span of 65 yearswhich is similar to today! And this, without medicine, without hospitals, without means of protection.