Life expectancy refers to the average number of years that a person is expected to live, typically based on statistical data and demographic factors such as age, gender, socioeconomic status, and health conditions. It is often calculated from birth, but can also be calculated for specific age groups or populations.
Life expectancy varies significantly between different countries and regions, as well as within populations based on factors such as access to healthcare, nutrition, sanitation, and lifestyle choices. Generally, life expectancy has been increasing over time due to advancements in healthcare, technology, and living standards, leading to improvements in overall health and longevity.
As of recent data, global life expectancy has been steadily increasing, with many countries experiencing significant gains in life expectancy over the past century. However, there are still significant disparities between developed and developing countries, as well as within populations, highlighting the importance of addressing health inequalities and improving access to healthcare and resources for all individuals.