人上了年纪之后,不仅会逐渐出现头发花白、耳聋眼花、牙齿脱落、满脸皱纹、思维迟钝、动作不灵、步履蹒跚等衰老现象,还易发生心脑血管等病而影响生命和健康。这是啥原因造成的呢? After getting old, people will not only gradually appear aging such as gray hair, deafness and vertigo, tooth loss, wrinkled face, sluggish thinking, ineffective movement and faltering, but also affect the life and health of cardiovascular and cerebrovascular diseases. What is the cause of this?