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generation time
In population biology and demography, the generation time is the average time between two consecutive generations in the lineages of a population. In human populations, the generation typically ranges from 22 to 32 years.〔 Historians sometimes use this to date events, by converting generations into years to obtain rough estimates of time.
== Definitions and corresponding formulas ==
The existing definitions of the generation time fall into two categories: those that treat the generation time as a renewal time of the population, and those that focus on the distance between individuals of one generation and the next. Below are the three most commonly used definitions:〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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