Good morning, Richard~
I'm glad you enjoy the east side of the barn. As it turns out, the boards are only about 20 years old. The previous owner had new rough-sawn White Pine put on a year or two before we bought it in '96. I have no plans to paint it!
The field stones probably go back much further. The farm itself goes back to 1825 - and we're pretty sure the house is of that era. The barn construction is post and beam so could be anytime since then.
All the best,
SJS