They keep farming even when their eyesight is failing and their hearts are going bad.
They get back on their tractors after farm accidents have put them in the hospital, sometimes with permanently disabling injuries.
Unlike the rest of the working world, where retirement at age 65 is typical and sometimes mandatory, most farmers keep working. Many die on the job, because they gamble with their aging bodies once too often.
"I think that is a huge piece of the problem," said Dennis Murphy, a Penn State professor who studies farm safety.
Serious accidents are a concern for farmers of any age, but the risk only increases as they get older. Physical tasks become tougher than they used to be, and often it's not easy — or even possible — to slow down.
Almost half of the Minnesotans who died in farm accidents in the past decade were 65 or older, according to a Star Tribune review of more than 200 death investigations.
In a small town just west of St. Cloud, pigs killed an 82-year-old farmer after he apparently fell into their pen. According to his death certificate, he walked with a cane and was "subject to dizzy spells."
On another farm nearby, an 86-year-old farmer burned to death when he stumbled while dealing with an out-of-control brush fire. His granddaughter told investigators she tried to talk him out of tackling the chore because he had trouble walking and had fallen several times recently.