List of generations

A generation is "all of the people born and living at about the same time, regarded collectively." It can also be described as, "the average period, generally considered to be about thirty years, during which children are born and grow up, become adults, and begin to have children of their own."

The word generate comes from the Latin generāre, meaning "to beget". The word generation as a cohort in social science signifies the entire body of individuals born and living at about the same time, most of whom are approximately the same age and have similar ideas, problems, and attitudes (e.g., Beat Generation and Lost Generation).

A familial generation is a group of living beings constituting a single step in the line of descent from an ancestor. In developed nations the average familial generation length is in the high 20s and has even reached 30 years in some nations. Factors such as greater industrialisation and demand for cheap female labour, urbanisation, delayed first pregnancy and a greater uncertainty in relationship stability have all contributed to the increase of the generation length from the late 18th century to the present. These changes can be attributed to both social factors, such as GDP and state policy, and related individual-level variables, particularly a woman's educational attainment. Conversely, generation length has changed little and remains in the low 20s in less developed nations.

An intergenerational rift in the nuclear family, between the parents and two or more of their children, is one of several possible dynamics of a dysfunctional family. Coalitions in families are subsystems within families with more rigid boundaries and are thought to be a sign of family dysfunction.

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