- •In low- and lower-middle-income countries, the adolescent population (10–19 years) is increasing and will continue to do so over the coming decades, while it is decreasing in upper-middle-income and high-income countries. Trends in the child population (0–9 years) are similar.
- •The overall population has shown dramatic increases in all income groups since 1980. These trends are projected to continue, particularly in low- and lower-middle-income countries.
- •The population of older people (60 years of age and over) is increasing dramatically across income groups.
- •With the increases in the overall population, and in the population of older people in particular, the percentage of adolescents in the total population has been decreasing since 1980 across all income groups with the exception of low-income countries. It is projected to continue to decrease everywhere, including in low-income countries.
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