First of all, we can say that there are 14600 days in 40 years.
The process of 40 years is a so long time period for a person. Also, there are 480 months in 40 years. We can observe that there are a lot of differences between today’s world and 40 years before. When we look before 40 years ago, the first important change will be the technology level. After 1970s, most of today’s technological devices were not inventioned. Only TV and radio were using by people at the 1970s world in different countries all around the world.
On the other hand, some of the biggest and most popular buildings of the world today did
not built in 40 years ago. So, when we look at the technological side, the period of 40 years is a so long time for today’s world when compared to the past times. The globalization process of the world started 40 years ago, but today the effects of it reached the maximum level. Today, communication and connection between people and countries are so easy when compared to the past times. Finally, calculating the number of 40 years will cause realizing the changing process of today’s world.