I don't put much stock in the stages of dementia idea. I think it's easier to conceptualize dementia in terms of mild, moderate and severe. Mild is when the person and loved ones notice that something is off but the person often can hide it or compensate for it. Moderate is when hiding and compensating are breaking down and the decline must be dealt with for the safety of the individual and those living both with and around them. Severe is when the person is becoming frail and quality of life is becoming poor given such things as poor nutrition, immobility, frequent falls and infections, which hasten end of life.
This offer me too largely because my dad is an early stage and here I replies from people who are dealt with the late stage and those are apples and oranges. If it's Alzheimer's, it's a straight downward curve. If it's vascular dementia, it goes in steps. The next step will be worse than the last time, so that's I think the first thing to determine and that takes a while to detrmine. My problem with posting on this board. Although I learn a lot, it's important to me that Dad uses all time he has available.
I think a lot of us get into stages because we are trying to figure out what's coming next and how much longer this will go on..... if your loved one hasn't reached end stage on any of the scales the answer to that final question is it could be years, maybe even decades.
there are many "charts" or lists that break down the "stages" I never put a lot of stock in what the stages were. My Husband was able to do things he should not have been able to do and there were things that he could not do when he should have been able to. Each person is different. The damage effects different parts of the brain and the parts of the brain that are damaged will determine that is effected. You can go on line and read the stages. The charts are pretty good at explaining the stages and what can and can not be done. There will always be over lapping of the stages.
Read up on the stages - I have a hand book The Savvy Caregiver guide - I think it Lists the stages . The progression Can Last years or there could be a sudden decline .
https://www.agingcare.com/articles/stages-of-alzheimers-disease-118964.htm
I never put a lot of stock in what the stages were. My Husband was able to do things he should not have been able to do and there were things that he could not do when he should have been able to.
Each person is different.
The damage effects different parts of the brain and the parts of the brain that are damaged will determine that is effected.
You can go on line and read the stages. The charts are pretty good at explaining the stages and what can and can not be done.
There will always be over lapping of the stages.
https://www.dementiacarecentral.com/aboutdementia/facts/stages/#scales