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The age structure of a population is crucial in population dynamics. The age structure of a population refers to the proportion of people in distinct age groups. The age structure allows for the correlation of population growth with the level of economic development in the region.

• In economically developed countries like the United States, The age structures are still pyramidal, but with fewer young and reproductive-aged people and a higher proportion of older people.
• Developed countries like Italy have a population growth rate of 0 percent. These populations have a more conical age structure, with a higher number of middle-aged and older people.
• Europe comprises mostly developed countries possessing a conical age structure, with a higher number of middle-aged and older people.

The age structure diagrams of countries with rapid growth have a pyramidal shape, indicating a majority of younger people, many of whom are or will be of reproductive age shortly. This pattern is especially common in economically developing countries, where people are less likely to live to old age due to poor living conditions.