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 average generation is the average age of parents at the time of birth of their children. When life span increases, so does the average length of generations. To show the extent of how life span varied over time, the average life span of the pre-Flood patriarchs was 912 years.