Economic development expresses the purpose for which we have developing economies. Standard economic lore, and especially capitalism, aim at continued growth and expansion of national economies so that developing nations become developed nations; and deride any possibility of an economic stable state.
Many national and international organizations and quangos foster economic development. Notably in the international arena we find:
... is spread out with 27.6% under the age of 18, 6.2% from 18 to 24, 17.7% from 25 to 44, 36.0% from 45 to 64, and 12.5% who are 65 years of age or older. The median age is ...