It is generally believed that elderly people over the age of 65 are at a significantly increased risk of dementia, and the prevalence is even higher among those over 80. However, there are exceptions, as some individuals may experience cognitive decline around the age of 50, which requires extra attention. The most common cause of dementia is Alzheimer's disease, a typical neurodegenerative disorder where various factors lead to the degeneration and death of neurons. Initially, patients mainly exhibit a decline in short-term memory functions, often mistaken for simple forgetfulness, resulting in a failure to seek diagnosis and treatment.