Understood from the vantage of Bronfenbrenner 's ecolological systems approach, initial transactions in a person 's life are the result of direct interrelationships between the infant and members of the microsystem (church, family, peers, school, neighborhood, play area, and health services). Microsystems, in turn, are shaped by a host of higher-up systems, which are also acting on each other at the same time. When the children in Bronfenbrenner 's model mature into adulthood, they are likely to occupy new roles within the macrosystem. These acquired roles may be transient because familial roles, career placement, financial status and other factors may vary throughout people 's lifetimes. Age, however, is one factor that invariably affects people 's lives, and society - to a large part - determines the extent of that effect.
Deep-rooted in the mentality of members of a system are beliefs about which members are suited to which roles. If a society assigns a value to the knowledge gained through a lifetime of experience, then people in late adulthood and beyond will perceive themselves as vital. Alternatively, if a society chooses not to recognize that elders have an important contribution to make in society, then the elders of that society may