R. Waldo McBurney is pretty consistently recognized as the Oldest Working American. Last I heard, he was already 104 years of age. He runs a bee keeping business so he is out collecting honey all day.
I love what he says about Living Defensively:
“We don’t get to choose our parents, but we select our lifestyles. Both of my parents died of strokes, so I have lived defensively against that trouble. The easiest way to shorten ones life is to do nothing.”