The line graph illustrates the percentage of the population in three different age groups over a period of eighty years.
Overall, it is clear that in the past, the proportion of people aged 0 to 14 and 15 to 64 generally declined, while the percentage of people over 65 years old gradually increased. In the future, the percentage of the 0-to-14 and 15-to-64 age group is estimated to decrease significantly at the end of the period; however, the percentage of the oldest age group is anticipated to witness a considerably rise.
Looking at the details, the proportion of the middle-aged (15-64 years) made up roughly 55% of the population in 1960, and there was a fluctuation over the next four years. Then the figure is projected to dramatically decline, finishing at around 45% in 2040. Meanwhile, the percentage of people between 0-14 years old steadily dropped from 1960 to 2020, and will be likely to decline in 2040.
On the other hand, the proportion of the oldest age group marginally grew in the first four years and overtaken the 0-14 age group by 2000. It is anticipated that the percentage of this group continues to rise, reaching approximately 45% by 2040. Another intersting point is that the proportion of the elderly accounted for the smallest share at first, but it is projected to nearly match the proportion of the middle-aged by the end of the period.