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.