Here is a link to the seven stages, but remember every person is different and will have exceptions to any chart or rule for determining where they are. Some, including my wife, seem to be in late stage 6, and yet most bodily functions are normal, but I have to be vigilant with things like safety, first aid, and her personal hygiene. I also have to monitor her food intake and I make smaller meals otherwise she will have second and third helpings. I suppose I could start fixing less tasty meals, lol.
https://act.alz.org/site/DocServer/sevenstages.pdf