: 39.9 years (2006 est.)

Belgium
total: 40.9 years
male: 39.6 years
female: 42.1 years (2006 est.)

Belize
total: 19.6 years
male: 19.5 years
female: 19.8 years (2006 est.)

Benin
total: 17.6 years
male: 17.2 years
female: 18 years (2006 est.)

Bermuda
total: 40.2 years
male: 39.3 years
female: 41 years (2006 est.)

Bhutan
total: 20.4 years
male: 20.2 years
female: 20.6 years (2006 est.)

Bolivia
total: 21.8 years
male: 21.2 years
female: 22.5 years (2006 est.)

Bosnia and Herzegovina
total: 38.4 years
male: 37.2 years
female: 39.5 years (2006 est.)

Botswana
total: 19.4 years
male: 18.8 years
female: 20 years (2006 est.)

Brazil
total: 28.2 years
male: 27.5 years
female: 29 years (2006 est.)

British Virgin Islands
total: 31.4 years
male: 31.6 years
female: 31.2 years (2006 est.)

Brunei
total: 27.4 years
male: 28 years
female: 26.7 years (2006 est.)

Bulgaria
total: 40.8 years
male: 38.7 years
female: 42.9 years (2006 est.)

Burkina Faso
total: 16.5 years
male: 16.3 years
female: 16.7 years (2006 est.)

Burma
total: 27 years
male: 26.4 years
female: 27.6 years (2006 est.)

Burundi
total: 16.6 years
male: 16.4 years
female: 16.9 years (2006 est.)

Cambodia
total: 20.6 years
male: 19.9 years
female: 21.4 years (2006 est.)

Cameroon
total: 18.9 years
male: 18.7 years
female: 19 years (2006 est.)

Canada
total: 38.9 years
male: 37.8 years
female: 39.9 years (2006 est.)

Cape Verde
total: 19.8 years
male: 19 years
female: 20.7 years (2006 est.)

Cayman Islands
total: 37.2 years
male: 36.8 years
female: 37.5 years (2006 est.)

Central African Republic
total: 18.4 years
male: 18 years
female: 18.8 years (2006 est.)

Chad
total: 16 years
male: 15.3 years
female: 16.6 years (2006 est.)

Chile
total: 30.4 years
male: 29.5 years
female: 31.4 years (2006 est.)

China
total: 32.7 years
male: 32.3 years
female: 33.2 years (2006 est.)

Colombia
total: 26.3 years
male: 25.4 years
female: 27.2 years (2006 est.)

Comoros
total: 18.6 years
male: 18.4 years
female: 18.9 years (2006 est.)

Congo, Democratic Republic of the
total: 16.2 years
male: 16 years
female: 16.4 years (2006 est.)

Congo, Republic of the
total: 16.6 years
male: 16.4 years
female: 16.9 years (2006 est