The graph below shows the proportion the population aged 65 and over between 190 and 2040 in three different countries

The line graph illustrates of the people aged 65 and over from 1940 to 2040 in three Sweden, Japan and USA countries.
Overall, all 3 countries of the people aged 65 and over increased sharply from 1940 to 2040. Japan, Sweden and USA were all high above 20%.
In three countries, Let me begin by describing the Japan had lowest aged 65 and over comparing 2 countries are Sweden and USA in 1940 and also highest country in 2040. From 1940 to 1980, most of 2 countries steadily increased to 13% -15%,Japan country went down about 3% population aged 65 and over. In 1940, Japan country had the lowest aged 65 and over accounting for 5%,USA highest accounting for 9%, in between the two countries, it’s Sweden accounting for 7%
Most noticeably of all, it can be seen that from 1980 to 2040, all significantly rise. From 2040, Japan country had reached the milestone 27% population aged 65 and over, lower had Sweden and USA 25% and 23%.