I have just been reading questions from caregivers regarding incontinence as well as other horrible conditions their loved ones are suffering, and no quality of life, I am looking Alzheimer's straight in the face (it runs in my family) in the next few years and just cannot stand imagining the horror of the disease as it will progress. Also, I have no relatives to see to my care, so I will be at the mercy of strangers.
It seems to me, I should be able to request euthanasia now, while I am in sound mind, for a time when certain criteria are met, even though I may not be of sound mind or actually dying then.
Now you might be aware that dementia can still be a happy disease until much later.
Have you talked with an elder attorney on how to appoint professionals to act on your behalf? You might want to set up a legal document concerning your wishes and give it to your spokesperson. Even if you are low on funding for your care, a probate judge will consider your wishes while you are well.
Some states in the US now have a process.
As I am certain you are aware, such a service does not exist in this country. It does exist in other countries, but qualification as an out of country citizen is quite tough, lots of time, examination and documentation.
Many organizations are working on right to die laws in our country. You can use any search engine to access them. Google "Death With Dignity".
Good luck on your research. Many feel as you do, and you are not alone.
Dignitas and Pegasos are both possibilities; however, as was pointed out in an earlier post, the process is neither quick nor easy. It is quite involved and pricey with both organizations, perhaps a bit less so with Pegasos. That said, I am not entirely dissuaded. If I can arrange the logistics and am still able to travel close to time of need, forking over my last $$ to Pegasos would make better sense (to me) than spending down my moderate assets to qualify for Medicaid and subpar "care" for who knows how long.
Predating the "Great Opioid Crisis", it was sometimes possible to obtain the essential pharmaceuticals from outside the U.S. Unfortunately, to my knowledge that avenue is essentially closed now unless you know someone in the criminal underground. (Actually, in my area one could probably score in the parking lot of the local high school except that an 86 Y/O would look SERIOUSLY out of place. Ha!)
Back to reality: I live in a state that has a MAiD (Medical Assistance in Dying) law, as do some other states now. The catch is that there are tough restrictions intended to "protect", which makes the law virtually useless to quite a few who might otherwise access it. Unless one has a somewhat predictable terminal illness, who knows if natural death can be expected within 6 months? Two physicians must attest to that. The patient also must be "of sound mind" which likely would disqualify someone with dementia, even if there is a healthcare directive executed before the condition developed.
Sorry this is so long, but it's a subject of considerable interest to me and probably to others. If anyone has more/better knowledge, I hope it can be shared.