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 is not an arbitrary period of time that occurs within the life span of an individual or group of people. Joshua's age at the time of death, 110 years (including 9 months gestation), was the length of the generation he represented. Some of his generation died before him and some after him.