This increase will be distributed among the population aged 15–59 (1.2 billion) and 60 or over (1.1 billion) because the number of children under age 15 in developing countries is predicted to decrease.
Većina dodatne 2,1 milijarde ljudi se bo rodilo v zemljah, ki so v razvoju in za katero se predvideva rast prebivalstva na 5,6 milijard v letu 2009.