The given line graph presents data about the proportion of population by different age cohorts in Japan from 1960 to now with the predictions for 2040.
Overall, the biggest part of the population in Japan was people who were aged between 25 and 64, while people aged over 65 saw the lowest results in the past and it is estimated that the lowest contribution rate will be presented by young people in the future.
In 1960, 25-64 age group started the period with around 65% contribution, which was followed by a slight increase to 70% in 1970 before experiencing a stable trend, which stood at less than 70% in 2000, after which it saw a gradual decrease to 60% in 2020. It was predicted that these figures will continue declining and will finish the period at around 57%.
Turning to other figures, in 1960, the contribution of young people to the number of population in Japan was 30%, which increased to 35% in 1970 before dropping to 30% in 1980, after which it kept untouched until 1990. The figures started declining in the new century, which dropped to 15% in 2020 from 20% in 2000, and it was estimated that this age group will finish the period with 10% contribution. People who were 65 and over started the period with 5% contribution and reached to 14% in 2000 before climbing to 30% in 2020, and this figure was expected to reach 35% in the end.