The percentages of people at 65 and over in 3 countries are under 10% in 1940. American leads with ratio of 9%, next is Sweden with about 7% and final is Japan with 5%. From 1940 to 1990, Japan slightly lowed down this number to approximately 3%. In contrast, this number in USA and Sweden continued to grow and met a peak at 15% and 14%. Since 1990, old Japanese number has risen dramatically. Up to now, this number has jumped to about 7%. Whereas, American has a stable percentage with a slightly fall of about 1%. Opposing to American, Swedish population has grown older quickly about 5% from the last peak. In the future, the three countries will encounter a sharp rise in aged population especially for Japan with 15% in the last decade. At the end of the period, the three countries will revert their positions with extreme percentages. Japanese will be on top of 27%, next will be Sweden with about 25%, finally, the US will follow at 23%.