| Rank | Country | Median age |
206 | Afghanistan | 
total: 17.6 years
male: 17.6 years
female: 17.6 years (2009 est.) |
| Akrotiri | void |
92 | Albania |
total: 29.9 years
male: 29.3 years
female: 30.6 years (2009 est.) |
122 | Algeria |
total: 26.6 years
male: 26.3 years
female: 26.8 years (2009 est.) |
148 | American Samoa |
total: 23.1 years
male: 23 years
female: 23.3 years (2009 est.) |
34 | Andorra |
total: 39.4 years
male: 39.7 years
female: 39.1 years (2009 est.) |
201 | Angola |
total: 18 years
male: 18 years
female: 18 years (2009 est.) |
76 | Anguilla |
total: 32.6 years
male: 31.5 years
female: 33.8 years (2009 est.) |
| Antarctica | void |
95 | Antigua and Barbuda |
total: 29.7 years
male: 28.2 years
female: 31.1 years (2009 est.) |
| Arctic Ocean | void |
91 | Argentina |
total: 30 years
male: 29 years
female: 31 years (2009 est.) |
81 | Armenia |
total: 31.5 years
male: 28.8 years
female: 34.4 years (2009 est.) |
49 | Aruba |
total: 37.8 years
male: 36 years
female: 39.5 years (2009 est.) |
| Ashmore and Cartier Islands | void |
| Atlantic Ocean | void |
52 | Australia |
total: 37.3 years
male: 36.6 years
female: 38.1 years (2009 est.) |
8 | Austria |
total: 42.2 years
male: 41.1 years
female: 43.2 years (2009 est.) |
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