I can’t tell you about the nutritional value over time but if you properly store it it can last up to two years. I use a plastic tub with a lid that has a seal and clicks on firmly, my flour is just as fresh as the day I stored it.
I’ve been having digestive issues with wheat flour so I started milling my own wheat berries and my digestive symptoms stopped. The bread is much more dense though.
Another thing you can boil the wheat berries eat them as a side dish.