Old people's metabolism is slow, and their body temperature will be lower than that of young people. This difference is greater in winter, and this will be found. Old people should try to keep warm or go to a warm place for the winter. There are many "migratory birds" in Hainan in winter. For example, Sanya may be crowded in winter. Other cities can be considered, such as Jintai Southern Yan Bay in Wanning National Bay Area, which is a good place for health preservation.