Bosnia and Herzegovina
total: 39.8 years
male: 38.7 years
female: 41 years (2009 est.)
Botswana
total: 21.7 years
male: 21.5 years
female: 21.9 years (2009 est.)
Brazil
total: 28.6 years
male: 27.8 years
female: 29.3 years (2009 est.)
British Virgin Islands
total: 32.3 years
male: 32.4 years
female: 32.2 years (2009 est.)
Brunei
total: 27.8 years
male: 27.7 years
female: 27.8 years (2009 est.)
Bulgaria
total: 41.4 years
male: 39.2 years
female: 43.6 years (2009 est.)
Burkina Faso
total: 16.8 years
male: 16.6 years
female: 17 years (2009 est.)
Burma
total: 28.2 years
male: 27.7 years
female: 28.8 years (2009 est.)
Burundi
total: 16.7 years
male: 16.5 years
female: 17 years (2009 est.)
Cambodia
total: 22.1 years
male: 21.4 years
female: 22.8 years (2009 est.)