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 ...

Population pyramids are bar charts that show how many people of different ages are living in a place or country. Population pyramids show the bars arranged sideways, rather than upwards. The x-axis ...

Population pyramids close population pyramidA population pyramid is a special graph that can be used to show the specific age breakdown of a population. show the structure of a population by comparing ...