Well, they experienced extended physical suffering and having the mental acuity of a toddler. Feel free to try to convince me that not being able to recognise your own kids and the person you have been married with for seventy years while gradually fully losing your hearing and sight and not being able to leave a bed is somehow a worthy experience. I personally question if you can even talk of experiencing anything because that would imply there is something left which can meaningfully process experiences. And that’s the part which came after the initial decline when they were just insanely mean to their loved ones all the time.
You do sound harsh by the way.