The first one lives in a vast area of overgrown clear cuts. I'm assuming he eats browse, blueberries and blackberries. In the areas that aren't cut, the mast is beech and cherry. We have an orchard and a couple fields in turnips and clover, but that guy doesn't ever show up in these places. He's a hermit.
The other 3 have been seen many times in our orchard, turnip and clover field. I assume they also eat a lot of browse in the spring and summer as they have clear cuts around them as well. They also have access to blueberries, blackberries, cherries and beech nuts. Also, in the winter, we put out alfalfa bales for the local deer.
Other than that, they are mountain deer. No agriculture.
I'm sure age helps.