The graph below shows the proportion of the population aged 65 and over between 1940 and 2040 in three different countries.

The ratio of elderly people aged 65 or above is expected to change over a hundred-year period, from 1940-2040, and the given line graph captures

this

transition in three countries USA, Sweden and Japan. At the beginning of 1940, only 5 out of every 100 Japanese citizens were aged 65 or beyond, but by the end of 1960,

this

fraction

further

reduced to 3 and remained the same until the late 1980s after which

a

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marginal growth was seen till 2000. Meanwhile, between 1940-1960, the percentage of senior citizens slightly increased from 9% to 10% and 7% to 9%, respectively in the USA and Sweden. Both these countries

then

showcased a similar steady rise over the next two decades ending with 15% and 14% old age people. In the 21st century, there was a noticeable surge in the proportion of the Swedish old age

population

, increasing from 15% in 2000 to 20% in 2015, followed by a cool-off period in the subsequent years. During the same duration, America’s elderly

population

proportion flattened out

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14%, only to see a gradual growth from the start of 2018.

Whereas

, in Japan,

this

population

number

have

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ascended steadily since 2000, and it is expected to skyrocket in a space of

few

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a few

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years from 10% in 2030 to 25% in 2035 and 27% in 2040.

Similarly

, it is projected that the proportion of old age citizens can surge up to 25% and 23% in USA and Sweden respectively.

Overall

, a generic upward trend is observed in the percentages of the senior

population

, and based on the estimates elderly will account for a quarter of the human species in the coming years.