The line graph displays data about the rate of the elderly people in three specific countries from 1940 to 2040.
Overall, the chunk of population aged 65 and over generally increased in all countries throughout the period.
In 1940, the proportion of elderly people in the USA, with an approximate value of 10%, was dominant among all countries, before the trend experienced a gradual increase to roughly 15% in 1980; afterwards, the percentage slightly fell and sharply increased to under 25% by 2040. Similarly, the rate of elderly people in Sweden was under 10% in 1940 and significantly rose to around 25% by the end of the period.
Moreover, the share of elderly people in Japan, with an approximate value of 5%, was the least among all remaining countries, before the figure witnessed a slight decline to under 5% in 1960; afterwards, the rate remained constant for the following twenty years and sharply increased to over 25%, stancing as the highest among all countries by the end of the period.
