When my dad was getting into his 80's, I prepared a ground blind for him that was about 150 yards from my back porch, in a small clearing in the heavy cedar brush next to my house. It was all he could do to reach it, and his first year (of two) sitting there, he took a nice buck with one perfect 40-yard shot, listening to my dogs barking, my neighbours (100 yards in the opposite direction) yelling at their dogs, a dirt-bike in the background...you get the picture.
Farm country deer have seen and heard it all and are used to it.
John