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.
Actually there is a number in the Bible of what a generation is which is about a hundred. You have to do outside Bible research but since the Abrahamic days the human race is about 100 years or two jubilees (49yrs plus 49 yrs). So it is for our time as predicted by a Christian in 1898.