(awltz´hi-mәr) irreversible dementia with intellectual deterioration, disorganization of the personality, and functional disabilities in carrying out activities of daily living . The official name is now dementia of the Alzheimer type . It is categorized as either presenile (early onset) or senile (late onset) depending on whether or not it begins by the age of 65, and is subcategorized on the basis of accompanying features, including delirium , delusions , depressed mood, behavioral disturbances, or none (uncomplicated).