The diagram illustrates the proportion of age groups residing in a certain nation from 1960 to 2040. Overall, adolescents dominated the population throughout the period. Evidently, elders saw an increase in percentage, opposing the decreasing number of children.
Initially, teenagers, ranging from 15 to 64 years, were the most common group in 1960, totaling approximately 55%. Children followed, having an exact percentage of 30%. In contrast, elders aged over 65 years were rare, accumulating only half of the number of youngers.
Apparently, older people experienced a steady incline in number, reaching 20% in 1990. Meanwhile, the number of the youth saw a moderate decline, sharing a similar amount to the elders. After that, the population of senior citizens skyrocketed, reaching just under 40% in 2025. It is expected that the number will continue to increase until 2040, maintaining an all-time high record of around 45%. On the other hand, the youth is predicted to see a constant decrease in number, remaining with only 10% in 2040. Evidently, the middle-aged group maintained a strong population, fluctuating to just under 50% in 2025, while decreasing to approximately 45% in 2040.