A definição dos parametros de uma geração

«Demographers have also been unable to agree on the new generation's exact parameters. Those who refer to Gen Yers as "Echo Boomers," children of the baby boomers, identify this generation as a huge one, spanning 20 years om 1978 to 1998. Others cut the gap to 10 years, defining Gen Yers as those born between 1978 and 1988. Both views are problematic. Since a generation is an identifiable age group with a shared historical experience, the time span of each new generation shortens as the pace of change accelerates. (...) If we are to define the next generational group, or cohort, any meaningful way, the time span must be shorter still, no more than seven years. That is why we have focused this study on those born between 1978 and 1984»(Martin e Tulgan, 2001: xii)