Dag is amazing but he's probably not the world's oldest ultrarunner.
Bernd Heinrich is 83 and recently wrote a whole book (highly recommend) about running and aging, Racing the Clock. There's also the Bay Area legend Eldrith Gosney who is the same age and still kicking. https://ultrasignup.com/m_results_participant.aspx?fname=Eld...
It's funny to imagine these authors pompously claim someone as "world's x" looking through the lens of the Western world being the whole world. I'm sure there's a women in rural Nepal who has carried water on her head uphill for longer distances and years, or a Masai tribesman who does 2x that hunting for baboons
In other words, people training for ultramarathons really are probably working harder than other people, even accounting for lifestyle and income disparities.
Bernd Heinrich is 83 and recently wrote a whole book (highly recommend) about running and aging, Racing the Clock. There's also the Bay Area legend Eldrith Gosney who is the same age and still kicking. https://ultrasignup.com/m_results_participant.aspx?fname=Eld...