Final answer:
Diagnosis of Alzheimer's disease is difficult because around 10% of the elderly complain of memory problems. Symptoms of the disease include disruptive memory loss, confusion about time or place, difficulty with planning and executing tasks, poor judgment, and personality changes.
Step-by-step explanation:
Diagnosis of Alzheimer's disease is difficult because around 10% of the elderly complain of memory problems. Alzheimer's disease is the most common cause of dementia in the elderly, and its symptoms include disruptive memory loss, confusion about time or place, difficulty planning or executing tasks, poor judgment, and personality changes. However, it is important to note that many of these symptoms can also be common in people who are aging normally, so the severity and longevity of the symptoms are what determine whether a person is suffering from Alzheimer's.