Chronic lethargy in a 68 yo woman

History of Present Illness

A 68-yr-old woman comes to the office with her daughter because of a 4-mo history of gradually increasing lethargy and worsening memory. Her daughter is concerned because the mother has stopped remembering whether she has taken her regular medications. The daughter is worried that her mother might not be safe to live on her own. Prior to 4 mo ago, the woman had been very busy with community activities, which she has since stopped, and her daughter had not noticed any memory difficulties. The daughter is not aware of any recent illnesses or injuries.