The given line chart illustrates the percentage of residents aged 65 and over in three countries: the USA, Sweden, and Japan, from 1940 to 2040.
Overall, the proportion of elderly residents in each country varied, with Japan consistently having the highest percentage, while the USA had the lowest in 2040.
In more detail, the percentage of people aged 65 and over in the USA increased significantly, rising from under 10% to about 15% between 1940 and 1980. After 1980, the proportion fluctuated between 13% and 23% over a period of 40 years.
In Sweden, the percentage of elderly residents grew steadily from just 7% in 1940 to nearly 15% by 1980. This was followed by a sharp rise to around 25% in 2040.
In contrast, the proportion of elderly people in Japan decreased slightly from 5% to 3% between 1940 and 1980. However, after 1980, it increased dramatically from 4% to over 25%, surpassing Sweden and reaching the highest point by 2040.
