[Long-range world population projections: two centuries of population growth 1950-2150 prepared by the United Nations in 1992]

Assuming replacement fertility the world population in 2150 will be 11.5 billion which is 4.6 times that of 1950. The greatest annual increase of 1.9% took place between 1950 and 1990 doubling the population over the same period. Its increase between 1990 and 2050 is expected to be 89%; the same between 2050 and 2100 12%; the same between 2100 and 2150 3%. The world population in 2150 will be quite aged. The median age of 24 in 1990 will be 42 in 2150. 18% of the population will be 15 and under; 24% will be 65 and over. The population aged 80 and over which was 1% in 1990 will be 9% in 2150. Nine regions of the world are divided into two groups: group 1 consists of North America Europe Oceania and the former Soviet Union; group 2 is Africa three regions of Asia and Latin America. Between 1990 and 2150 98% of the increase in world population is expected to take place in group 2. The African population will increase most rapidly and will constitute 27% of the world population by 2150. The population increase in group 1 was 45% between 1950 and 1990 and is expected to be 13% between 1990 and 2050. Between 2050 and 2150 population is expected to decrease by 3%. Group 1s population ratio to world population in 2150 will be 10.4%. The population ratio of Europe in 2150 will be as low as 3.7%. The ratio of population below age 15 will decrease from 22 to 18% in group 1 and from 35 to 18% in group 2 between 1990 and 2150. The population over age 65 will dramatically increase from 12.1 to 24.7% in group 1 and from 5 to 25% between 1990 and 2150. During the same period the population over age 80 will increase from 0.6 to 9.6%. A world population of 11.2 billion in 2100 according to this particular projection is 10% larger than the 1982 projection of a stable population of 10.2 billion in 2100. Current projections predict a stable world population of 11.6 million in 2200.