摘要
Aging in humans refers to a multidimensional process of physical, psychological and social change. One＇s reaction time, for example, may slow with age. Some age-related physical changes are obvious： An extra laugh line or two, graying hair and additional weight around the midsection. But many changes, such as the gradual loss of bone tissue and the reduced resiliency of blood vessels, go unnoticed, even for decades. Even though you are not aware of the changes, they are happening. As a woman ages, her skin usually turns dark and rough, and/ or wrinkles begin to appear.
