This is what I have on stages: I wanted to type it in so you wouldn't have to look it up.
Stage 1 - No impairment, not detectable and no memory problems (not sure why they feel its necessary to label this as a stage but, they did)
Stage 2 Very Mild Decline - person may notice memory problems or lose things around the house but still do well on memory tests.
Stage 3 Mild Decline - friends and family notice memory and cognitive decline. Performance on memory tests is affected. Difficulty with - finding the right word to say during conversation
- remembering name of new acquaintance
- planning and organizing
- frequently lose personal possessions and valuables
Stage 4 Moderate Decline - clear cut symptoms apparent. Problems with simple arithmetic, forget details of life histories, poor short term memory - not recall breakfast - , inability to manage finances
Stage 5 Moderate to Severe Decline - begin to need help with day-to-day activities
- significant confusion
- inability to recall own phone number
- difficulty dressing appropriately
- maintain a modicum of functionality. Typically still bathe and toilet independently. usually still know family members and details of personal histories, especially of childhood and youth.
Stage 6 - Severe Decline - need constant supervision and frequent professional care. Unaware and confusion of environment and surroundings. Major personality changes and potential behavior problems. Need assist with activities of daily living, toileting, bathing. inability to recognize faces except closest people. Loss of bowel and bladder control. wandering.
Stage 7 - Very Severe Decline - lose ability to respond to environment or communicate. No insight to their condition. Needs assistance with everything. Lose ability to swallow, body movements become more rigid and may cause severe pain. Contractures form and become immobile. Speech limited to few words or is lost, unable to sit up independently. Grim facial movements replace smiles.
This is from my past research. Guideline I found said
Mild, early stage = about 2-4 years
Moderate and middle stages = 2-10 years
Severe to late stages = 1-3 years
Hope this helps. It did help me along the way.