This was from a while ago but like so many things, I've discovered it late:
Courtesy of MedlinePlus:
Dementia (Also called: Senility)
Dementia is a word for a group of symptoms caused by disorders that affect the brain. It is not a specific disease. People with dementia may not be able to think well enough to do normal activities, such as getting dressed or eating. They may lose their ability to solve problems or control their emotions. Their personalities may change. They may become agitated or see things that are not there.