We seem fascinated by generations, using them to evoke shared experiences and to push us apart. Demography, the science of population change, defines a cohort as a group of people born at roughly the ...

Since humans started organizing into communities, the shape of any given society, broken into age groups and gender, has always resembled a pyramid: The largest age group has always been the youngest ...

THE pyramid is a traditional way of visualising and explaining the age structure of a society. If you draw a chart with each age group represented by a bar, and each bar ranged one above the ...