Human aging does not happen gradually, according to new research.
Stanford scientists have found that this process occurs in sharp bursts: at 44 and 60 years of age.
The changes that occur during these periods may explain the appearance of wrinkles, sagging skin, gray hair, vulnerability to disease and joint pain, writes National Geographic .
According to John White, a physician and former director of the U.S. Food and Drug Administration, the study shows why people suddenly start feeling older.
At the same time, the traditional idea that aging is a slow and continuous process is being questioned.
The study also suggests that changes associated with aging may occur more suddenly at certain times in life.
Scientists emphasize that these results should not cause fear for those aged 44-60.
Understanding the causes of aging will help scientists and people take the right steps to prevent unwanted consequences.
