This guy doesn't really farm. If he did, he'd be in much better shape. I had family who were serious farmers (many chores everyday) and they were lean/skinny like runners even in old age. This guy overeats and doesn't get much activity.
As someone from a family of farmers, yes, people can be fat and work on farms. I know people who are in the fields everyday and with beer bellies like you wouldn't believe.
This man is 72. The fact he's working outside well past the age of retirement for most people shows he's not in completely terrible shape.