What is aging?

Aging is when the body shifts from a constructive (anabolism) to a destructive (catabolism) state. Anabolism is the replenishing of the body’s systems with new and stronger tissue, a rejuvenating or building mode. Catabolism is the breaking down of the body’s physiological systems. Physiological functions peak in the twenties, plateaus in the thirties, and then begins a sharp descent in the forties. In the U.S. the “decade of vulnerability” occurs at the age of 40 to 50 years. During this time, the male ages 15.2 years and the female ages 18.6 years.

Aging is the process of growing old or maturing. Humans reach their peak in growth and development when they are in their mid 20s. After this point, the body gradually becomes less functional over time.

Aging typically causes weakness, increased susceptibility to disease and infection, loss of mobility and agility, and age-related physiological changes, such as wrinkled skin and gray hair. In the United States, about two-thirds of people age 65 and over take medications for various conditions.

Currently, the average life expectancy in the United States is about 75 years for males and 80 for females. Although genetic makeup has been shown to influence an individual's life expectancy, individuals are more likely to live long and healthy lives without disabilities if they take care of their bodies with proper diets, lifestyles, and medications.

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