My mother-in-law is deaf as a door nail. The classic line my wife and I joke about is during one Christmas visit we were talking and wife asked her a question and she replied with the time of day. "Mom, do you want water or tea with dinner? Oh, it's about 10 to 5....."
So my wife finally took her to get aids. It was a battle and in the end she stopped wearing them. She didn't have a hearing problem, everyone else has a mumbling problem.