Cambridge IELTS 5 T1 The line graph illustrates the percentage of aging population (over 65 years old )during a long period of one century since 1940，in Japan ,Sweden and the USA .There is a generally upward trend of population in all of the three countries . At the beginning ,in 1940 ,the USA comprises the most aging people than the other two countries ,with approximately 10%.And during the following 100 years ,it increases steadily and is expected to reach 23% in 2040. Sweden shares the same stably rising trend with the USA ,going up from about 7% in 1940 to 25% in 2040, surpassing the USA in the end . Japan is much different from the two countries mentioned before ,which has a dramatically growth in aging population ,going up from 5% to 27%.It is obvious that Japan overtakes Sweden and the USA with the greatest rising extent of 22%. Overall ,the number of elder people increased and is expected to rise still in the future .