The line chart compares how the distribution of population density varied across different age cohorts in a specific nation, commencing in 1960, against its projection until 2040.
Overall, the population became more aging with an upward trajectory in that of senior citizens aged over 65, along with children’s corresponding fall. Meanwhile, those aged 15-64 broadly remained stable with a slight decrease by the end of the period, albeit consistently remaining the largest contributor.
As for the age group showing the least volatility, residents falling into the 15-64 group stood out as a primary one, whose share was over half at the outset. The figure fluctuated around that mark until 2010, before being anticipated to edge down to roughly 47% by 2040.
By contrast, other age cohorts exhibited more notable changes, although they followed differing trends. In the first year, approximately 16% of older people aged over 65 was recorded. After the next four decades, it experienced a modest upswing to one-fifth, reaching the same level as the segment for children aged under 14, before being expected to end with the leading position, by surging to just above 48%. This substantial growth was mainly due to a sharply two-fold drop from 30% by 1960 to 15% by 2000 in the population of those aged under 14. By 2040, it is projected to contribute only one-tenth to the total share, after tapering off from 2000.