The changing balance among age groups

As noted in chapter 1, the present and future age composition of a population evolves as a function of the past population size and distribution, and the present and future fertility and mortality rates. In countries where net migration flows are significant, the age structure is also affected by the migration history. As a result of the documented changes in fertility and mortality, the balance among age groups in the global population is changing significantly. One major expression of these changes is population ageing and the trend toward a more uniform global population distribution by broad age groups than ever registered before.

Related Subject(s): Population and Demography