Im not to worried about the child thing other than my life is basically pointless at that point and I honestly don't see much of a point of the cost of my being alive at that point. The bigger thing to me is actually the physical. Not being able to feed yourself or eat solid food, not being able to get around by myself. The whole fingers and toes curling up which moves to arms and legs. The thing with the mental state is if you had full cognition and adequate support. Like hawking. Then you still have quality of life in terms of mental stimulation. If your mind is gone but your still good physically then there is a sorta quality of life. You can have some childlike happiness. But man once both go beyond a certain point (and the mental really goes first) its just omg bring the sweet relief.