The provided line chart depicts the age distribution in a specific country from 1960 to 2040.
Overall, the eldest group accounts for the lowest rate of population, whereas the young-to-adult group made up the highest proportion in 1960, before both groups are projected to end at about the same level by the end of the period.
Specifically, the young-to-adult group had the highest rate of population, accounting for approximately 55% of the total population in 1960, while the eldest group stood at about 16% of the total population. However, the youngest group accounted for approximately 30% of the total population, before declining to nearly 10% by this year, which means that the birthrate gradually declined.
On the other hand, the eldest group is expected to experience a gradual surge and reach nearly the same level in 2040, which stood at around 45% of the total population. Additionally, the young-to-adult group slightly declined to approximately 10% by 2040, which means that the birth rate is still at its lowest level since 2000.