The graph below shows the proportion of the population aged 65 and over between 1940 and 2040 in three different countries. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line graph illustrates how many elderly aged 65 or older over a century (from 1940 to 2040), percentage-wise, for the

USA

,

Sweden

, and

Japan

.

Overall

, a notable increase in the proportion of the

population

aged 65 and over is observed in all three countries.

Japan

starts with the lowest number of elderly but experiences remarkable growth, potentially surpassing the

USA

and

Sweden

at the end

of the period. The

USA

,

in contrast

, is forecasted to end up at the bottom rank even though placed first

initially

.

Moreover

, the elderly

population

grew slowly until 2020, yet a significant jump is predicted to happen towards the final. The trend for American and Swedish is more or less similar from 1940 to 1980. Starting at just below 10% and around 7% respectively, the

USA

and

Sweden

rose to just above and below 15% in 1980. But, between 1980 and 2000,

Sweden

's elderly part outraced the

USA

and is projected to make up a quarter of its total

population

in 2040.

Instead

, a steady rise for the

USA

ended up a little below

Sweden

's.

On the other hand

,

Japan

's direction is quite distinct. In the beginning, only about 5% of their

population

was elderly. The number slowly climbed up and is expected to reach 10% in 2030 before skyrocketing by approximately 10%. The projection shows

Japan

will become the country with the highest elderly

population

among those three in 2040 with more than a quarter of its citizens aged 65 years old and over.