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 time span of a generation is often considered approximately twenty years. Generation X is one descent after the Baby Boom generation, which is currently the largest generation. The Baby Boomers were born in the years following World War II, roughly 1944 - 1964. Today, there are approximately 80 million Baby Boomers.