Dementia in the elderly, mainly refers to Alzheimer's disease. Early signs of this condition may manifest as some forgetfulness. For example, a patient might forget to add salt while cooking, or forget to bring their keys when leaving the house. These clinical signs should be highly alarming and should not be dismissed as mere forgetfulness, ignoring further examinations and treatments. It is recommended that if the elderly show signs of diminished memory function, they should promptly visit a hospital. Comprehensive assessments and further tests, including brain MRI scans, should be conducted to check for significant atrophy in brain areas such as the temporal lobes and hippocampus. If dementia is diagnosed, prompt intervention and treatment should be pursued.