老年痴呆症是一种常见的老年疾病，也被称为阿尔茨海默病。它是一种逐渐恶化的病症，通常影响中老年人，尤其是超过65岁的人群。症状包括逐渐丧失记忆，语言能力和思维能力的退化，日常生活能力的降低。老年痴呆症是一种非常严重的疾病，目前还没有找到治愈的方法。

The elderly dementia is a common disease among the elderly, also known as Alzheimer's disease. It is a gradually worsening condition that typically affects middle-aged and elderly people, especially those over the age of 65. Symptoms include a gradual loss of memory, a decline in language ability and thinking ability, and a reduction in daily living ability. Elderly dementia is a very serious disease, and currently there is no cure for it.