Answer:
The main reason why these people live to an advanced age is better medical care. But average life expectancy is also increasing because the rate of infant mortality has fallen across the world.
The more in depth answer is under the 'Explanation' part.
Explanation:
List of reasons for increased life expectancy in the United States.
-Healthcare.
-Sanitation.
-Nutrition.
-Working conditions.
Life expectancy has increased rapidly since the Age of Enlightenment. In the early 19th century, life expectancy started to increase in the early industrialized countries while it stayed low in the rest of the world. This led to a very high inequality in how health was distributed across the world. Good health in the rich countries and persistently bad health in those countries that remained poor. Over the last decades this global inequality decreased. No country in the world has a lower life expectancy than the countries with the highest life expectancy in 1800. Many countries that not long ago were suffering from bad health are catching up rapidly.Now Humans are living longer around the world. While there have been obvious ups and downs, life expectancy at birth overall has been steadily increasing for many years. It has more than doubled in the last two centuries. This increase was previously driven by reductions in infant mortality
