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

The given graph illustrates the trend of the over 65 years old Americans, Swedish and Japanese percentage, during a hundred-year time span, starting from 1940. At first glance, it can be seen that all the three countries experience a general growth and are expected to peak in 2040. In particular, Japan's pattern is substantially different compared to the other nations' data. In fact, between 1940-1980, the percentage of people under consideration experiences a steady growth in the USA and Sweden, increasing by about 5 per cent. On the other hand, Japan's elderlies slightly decrease, bottoming at about 3 per cent. Commencing from the late 80s, a steady rise of over 65 years old Japanese can be observed; with a sudden surge in 2030 and peaking at more than 25 per cent in 2040, Japan is the country who hits both the highest and lowest percentages. Meanwhile, the USA's percentage plateaus at just under 15 per cent and, later on, steadily increases. At the same time, Sweden fluctuates a bit more, reaching exactly 25 per cent in 2040.