I am trying to understand the type of dementia a lady I care for has. She has had it over 20 years. She shows no signs of physical decline after all this time, takes no medication. Her symptoms began as forgetfulness, then it progressively got worse. She is not able to put words together in sentences and is sometimes difficult to get her to cooperate. She does have sundowning as the later in the day it gets the less cooperative she is. I love this sweet lady and wish there was more I could do for her. Anyone know what type of dementia this could be? Does not act like Alzheimer's or LBD. Any thoughts would be appreciated.
You don't mention her age (with a 20 year history I would assume she is 70-80ish, possibly older. Purely guessing, as I know nothing more than what you said, and I am by no means a neurological expert and you don't mention any real decision-making, emotional or physical problems, sounds like either of a couple of things, or a bit of both: Primary Progressive Apashia, mentioned by yogagirl, and Mild Cognitive Impairment, which is more related to normal aging process. Again, talk to her doctor.
It could be a frontal lobe disorder called Primary Progressive Aphasia.
Sad, but unfortunately there is not much you can do.