A 69-year-old man is brought in by his son for a psychiatric evaluation. His son is concerned because the patient is getting lost while driving in familiar areas like his neighborhood. He is not able to organize his finances and pay his utility bills. He finds it difficult to find the right word to express himself. He cannot remember the names of his grandchildren. He gets irritated when asked about his memory lapses. His past medical history is significant for a few episodes of delirium during hospitalizations and vitamin B12 deficiency successfully treated with medications. According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), which of the following is part of the criteria required to diagnose this individual with major neurocognitive disorder?
