I looked into this recently and it seems like it is basically impossible to pre-arrange assisted suicide for alzheimer's or dementia. Even in countries which allow death with dignity. I find it very strange because it’s so common and I’m sure many people would prefer DWD in those circumstances.
shouldn't finding a way to kill yourself be pretty easy, even without legal DWD? you can overdose on OTC meds, or get a knife, or (in America) pick up a gun.
To me, it doesn’t seem strange at all because I’m thinking about how complicated the system would have to be to carry out such a directive.