What might happen to Estonia's population in the next few decade and what will be the percentage of children, young people, working- and retirement-aged people in the population? Population projections show how the composition of the population is likely to change in a certain time span. When preparing population projections, current trends in births, deaths and migration are extended to the future. However, many variables need to be taken into account, such as the number of children and the age of mothers, mortality in different age groups, the age distribution of the migrating population and