Dictionary of Human Evolution and Biology

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Generation Length

For continuous reproducers, either the mid-point or mean age of a sibship subtracted from the average age of the parents. In hominoids, 15-25 years, with values toward the lower figure in the great apes and early australopithecines, and toward the higher in the later, more K-selected hominids. One million years would thus consist of 67 k generations of 15 years each, 50 k generations of 20 years, or 40 k generations of 25 years. Aka generation time.

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