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This is a collection of lists of countries by average life expectancy at birth

Methodology
The life expectancy is shown separately for males and females, as well as a combined figure. Several non-sovereign entities are also included in this list.

The figures reflect the quality of healthcare in the countries listed as well as other factors including ongoing wars, obesity, and HIV infections.

Worldwide, the average life expectancy at birth was 71 years (70 years for males and 72 years for females) over the period 2010–2015 according to United Nations World Population Prospects 2015 Revision, or 69 years (67 years for males and 71.1 years for females) for 2016 according to The World Factbook. According to the 2015 World Health Organization (WHO) data, women on average live longer than men in all major regions and in all individual countries except for Mali and Eswatini (Swaziland).

The countries with the lowest overall life expectancies per the WHO are Sierra Leone, the Central African Republic, the Democratic Republic of the Congo, Guinea-Bissau, Lesotho, Somalia, Eswatini, Angola, Chad, Mali, Burundi, Cameroon, and Mozambique. Of those countries, only Lesotho, Eswatini, and Mozambique in 2011 were suffering from an HIV prevalence rate of greater than 12 percent in the 15–49 age group.

Comparing life expectancies from birth across countries can be problematic. There are differing definitions of live birth vs stillbirth even among more developed countries and less developed countries often have poor reporting.

List by the World Health Organization (2015)
2015 data published in May 2016.

List by the United Nations, for 2010–2015
On July 2015, the Population Division of the United Nations Department of Economic and Social Affairs (UN DESA), released World Population Prospects, The 2015 Revision. The following table shows the life expectancy at birth for the period 2010 to 2015.

[[File:Life Expectancy 2005-2010 UN WPP 2006.PNG|thumb|upright=2.05|UN World Population Prospects – The 2006 Revision: 2005–2010 Life Expectancy at birth (years).

List from the GBD 2010 study
The Global Burden of Disease 2010 study published updated figures in 2012, including recalculations of life expectancies which differ substantially in places from the UN estimates for 2010 (reasons for this are discussed in the freely available appendix to the paper, pages 25–27, currently not available). Although no estimate is given for the sexes combined, for the first time life expectancy estimates have included uncertainty intervals.

List by the CIA (2017)


The US CIA published the following life expectancy data in its World Factbook.