[tsimionescu]

The big problem with Alzheimer or dementia is related to consent and timing. People's memory dissolves pretty slowly. You'd almost certainly not want to be euthanized when you've just started forgetting where you've put your keys more often. Many would rather be euthanized than continue being a burden when they have stopped even remembering that bathrooms exist or who their family was. Between these extremes you can have many years, maybe even a decade, of good and bad days, weeks, months.