Hello William,
So sorry. Many of these responses should give you comfort and ideas.
I do not expect to be around more than 3 years. My wife is very smart but not interested in operating "machinery". Here is what I have done:
1. Eliminated all equipment that my wife is not comfortable looking at. 2. Made a detailed outline of how to turn it on and listen to either CD or tuner. And how to turn it off. 3. Put round label next to everything she needs to touch, labelled 1-7. 4. Let her practice using my outline. Every time she wrinkled her brow, I revised it for her. 5. Prepared a detailed listing of all equipment and its purchase cost.
My wife has become comfortable using the system (almost). And now likes to listen to it. In the end, I have to accept as fact that as soon as some cable comes loose and the system no longer produces sound, she will pronounce it broken; that will be the end of it. What is more important is the time I spend with her now; what I do for her now. As for the rest, she will be financially comfortable and travel until it is her turn to say goodbye.