Of or involving the cells of an organization or movement: The assessment of opposition to any totalitarian regime ... is notoriously difficult, for any effective movement must be secretive and cellular (Anthony Sampson). 4. Of or relating to a cellular telephone.
In the past, a human generation has been considered to be 20-25 years. Older genealogical documents will use these numbers. However, genealogical studies have revealed that this is too simplistic and can result in large inaccuracies during statistical calculation.
The length of a generation has not always been constant since the days of Adam and Eve. Before the Biblical flood, the average life span of man was over 900 years. Today, if a person lives to be a hundred years old, it is a special occasion in which the person is accorded celebrity status.