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If it's a new or recently escalated delusional state, then I'd be calling for medical input asap. My grandmother lived with dementia for over ten years and was overall healthy until a series of events and infections in the last six months of her life.
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Delusions are often caused by UTI's.

Of course, nobody can make a guess how long is left.
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I agree that if behavior has changed "suddenly" your LO should be taken to Urgent Care or ER and checked for a UTI, dehydration, or other possible causes that would create the symptoms you describe.

I think the progression of the disease depends on what type of dementia it is and the individual who has it. My Aunt is 100-yrs old and has had dementia for at least 10 years. She has no other health problems but is barely mobile. She has fallen and broken bones 2x and recovered.
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How are you defining delusional? Because, that can start at any point with dementia. My husband sees vapor trails, or thinks there are extra cats in the living room. I dunno, to me it's just part of the disease. My mother had nice chats with an invisible guy-she had end stage cancer.
If anything, I am watching for physical decline in my husband-less mobility, sleeping more, weight loss, apathy, and so on. Cognitive decline is a given with dementia-and the delusions (so far) do not bother me at all. For me, it's a peek into the way they see the world and it's ok.
There really aren't any terminal diseases that have a predictable length of time until death.
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Doctors several decades ago used to say that after any diagnosis of Alzheimer's Dementia a patient had 5 to at most 8 years to live. As that has proven absolutely mistaken, they seldom will "guess" in this day and age.
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