Do a lot of men my age find so many much younger can't keep up with us

I have 15-20 something years olds quit and can't keep up with me in the ginseng fields. That's just picking rock on only a 6 acre field. They can't last past 4 hrs and I even let them swap out driving a tractor.

My family and me can pick rock for 9 hrs with a half hr lunch and still keep going if we need to.

I don't drive the tractor, they make lazy and slow. I rather let everyone else drive. I pick rock all day by hand and I'm 57