The areas of the tongue sensitive to tastes. The classical theory about the physiology of taste recognizes the existence of four fundamental tastes - sweet, salty, sour and bitter - each being perceived by specific areas of the tongue by means of gustatory receptors, also known as taste buds.
Theories of Aging. Theories of Aging. Erik Erikson, who took a special interest in this final stage of life, concluded that the primary psychosocial task of late adulthood (65 and beyond) is to maintain ego integrity (holding on to one's sense of wholeness), while avoiding despair (fearing there is too little time to begin a new life course).
Age is defined as a span of years during which some event occurred. The number of years that ice covered most of the world is an example of an ice age. The definition of age is the number of years something has been alive or in existence. An example of age is being 16 years old. Age means to experience the passage of time or show signs of growing older. 1  To allow wine to ferment and develop its flavor over a certain number of years is an example of the process used to age wine.  An example of age is a person who grows from 15 years old to 60 years old.