Facts

Malawi:

population: 13,603,181

median age: 16.7 years

infant mortality rate: 9%

life expectancy: 42.9 years

percentage of population that is HIV positive: 14%

Comparatively, the U.S.:

population: 301,139,147

median age: 36.6 years

infant mortality rate: .006%

life expectancy: 78 years

percentage of population that is HIV positive: 0.6%

Sources:
https://www.cia.gov/library/publications/the-world-factbook/geos/mi.html
https://www.cia.gov/library/publications/the-world-factbook/geos/us.html
http://www.who.int/countries/mwi/en/