The dependency ratio is calculated as the ratio of the population typically not in the labour force (dependents, aged 0-14 and 60+ or 65+) to the population typically in the labour force (working- age population, aged 15-59 or 15-64). A declining dependency ratio means that the proportion of the working-age population is increasing relative to the dependent population. This phenomenon, often referred to as the 'demographic dividend', occurs when the birth rate falls, leading to a smaller proportion of young dependents, while the large cohorts born earlier are now entering the working age.