| Rank | Country | Median age |
109 | Azerbaijan | 
total: 28.2 years
male: 26.6 years
female: 30 years (2009 est.) |
103 | Bahamas, The |
total: 28.7 years
male: 27.9 years
female: 29.5 years (2009 est.) |
88 | Bahrain |
total: 30.1 years
male: 33.2 years
female: 26.7 years (2009 est.) |
147 | Bangladesh |
total: 23.3 years
male: 22.9 years
female: 23.5 years (2009 est.) |
62 | Barbados |
total: 35.8 years
male: 34.7 years
female: 36.9 years (2009 est.) |
44 | Belarus |
total: 38.6 years
male: 35.6 years
female: 41.6 years (2009 est.) |
11 | Belgium |
total: 41.7 years
male: 40.4 years
female: 43 years (2009 est.) |
175 | Belize |
total: 20.4 years
male: 20.3 years
female: 20.6 years (2009 est.) |
213 | Benin |
total: 17.2 years
male: 16.8 years
female: 17.7 years (2009 est.) |
16 | Bermuda |
total: 41.3 years
male: 39.9 years
female: 42.7 years (2009 est.) |
144 | Bhutan |
total: 23.9 years
male: 24.5 years
female: 23.3 years (2009 est.) |
156 | Bolivia |
total: 21.9 years
male: 21.3 years
female: 22.6 years (2009 est.) |
31 | Bosnia and Herzegovina |
total: 39.8 years
male: 38.7 years
female: 41 years (2009 est.) |
160 | Botswana |
total: 21.7 years
male: 21.5 years
female: 21.9 years (2009 est.) |
| Bouvet Island | void |
106 | Brazil |
total: 28.6 years
male: 27.8 years
female: 29.3 years (2009 est.) |
| British Indian Ocean Territory | void |
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