Life expectancy is the number of years a person is likely to live. In 1800 AD, the life expectancy was 28.5 years and the population was 1 billion. Today life expectancy is around 73 years and the world population is 8 billion.
So, in 1800, life years were 28.5 billion years ( life years = population * life expectancy ). Today human life years are around 584 billion years.
It is said that the earth’s resources are limited. We should preserve it, otherwise, humans will cease to exist. Contrary to this, the American economist Thomas Sowell said that the cavemen had the same natural resources at their disposal as we have today and the difference between their living standard and ours is a difference between the knowledge they could bring to bear on those resources and the knowledge used today.
Thus, knowledge is playing a very important role in making the world more and more wealthier . But knowledge and money are the derivatives of human life years. If there are more human life years, there will be more knowledge and more wealth at a global level .
It is normally observed that wealthier countries have a high life expectancy. On the other hand, we can say that a higher life expectancy will lead to more knowledge and wealth for the nations.
To conclude, we want to increase life expectancy to improve our living standards.
