长寿是人类的愿望。然而,人究竟能活多久?长寿的有利条件和不利条件有哪些?这些问题目前在科学上还不可能作出令人满意的回答。但是,有关医学专家,特别是老年学家们正在致力于这方面的研究。人们相信,许多问题将逐渐明朗化。 Longevity is a human wish. However, how long can people live? What are the favorable conditions and unfavorable conditions for longevity? These questions are not scientifically possible to make a satisfactory answer. However, relevant medical experts, especially gerontologists, are working on this aspect of research. People believe that many problems will gradually become clear.