My in-laws have 5 acres. Karl has been leading the charge in digging in to help with yard work. Our boys & their 2 cousins got in on it too.
At one point, one of my nephews asked his father when they could have a break. He pointed to my father-in-law and said
See that 71 year old man over there? When he stops you can stop.
I think the boys got a new appreciation for hard work and their Opa.