female: 21.4 years (2008 est.)

Brazil
total: 28.3 years
male: 27.5 years
female: 29 years (2008 est.)

British Virgin Islands
total: 32 years
male: 32.1 years
female: 31.9 years (2008 est.)

Brunei
total: 27.5 years
male: 27.5 years
female: 27.5 years (2008 est.)

Bulgaria
total: 41.1 years
male: 38.9 years
female: 43.4 years (2008 est.)

Burkina Faso
total: 16.7 years
male: 16.5 years
female: 16.9 years (2008 est.)

Burma
total: 27.8 years
male: 27.2 years
female: 28.4 years (2008 est.)

Burundi
total: 16.7 years
male: 16.4 years
female: 17 years (2008 est.)

Cambodia
total: 21.7 years
male: 21 years
female: 22.5 years (2008 est.)

Cameroon
total: 19 years
male: 18.9 years
female: 19.2 years (2008 est.)

Canada
total: 40.1 years
male: 39 years
female: 41.2 years (2008 est.)

Cape Verde
total: 20.6 years
male: 19.9 years
female: 21.5 years (2008 est.)

Cayman Islands
total: 37.8 years
male: 37.4 years
female: 38.2 years (2008 est.)

Central African Republic
total: 18.7 years
male: 18.4 years
female: 19 years (2008 est.)

Chad
total: 16.4 years
male: 15.2 years
female: 17.5 years (2008 est.)

Chile
total: 31.1 years
male: 30.1 years
female: 32.1 years (2008 est.)

China
total: 33.6 years
male: 33.1 years
female: 34.2 years (2008 est.)

Colombia
total: 26.8 years
male: 25.9 years
female: 27.8 years (2008 est.)

Comoros
total: 18.7 years
male: 18.5 years
female: 19 years (2008 est.)

Congo, Democratic Republic of the
total: 16.3 years
male: 16.1 years
female: 16.5 years (2008 est.)

Congo, Republic of the
total: 16.7 years
male: 16.5 years
female: 17 years (2008 est.)

Cook Islands
total: 29.8 years
male: 29 years
female: 30.4 years (2001 census)

Costa Rica
total: 27.1 years
male: 26.7 years
female: 27.6 years (2008 est.)

Cote d'Ivoire
total: 19 years
male: 19.2 years
female: 18.9 years (2008 est.)

Croatia
total: 40.8 years
male: 38.9 years
female: 42.6 years (2008 est.)

Cuba
total: 36.8 years
male: 36.1 years
female: 37.5 years (2008 est.)

Cyprus
total: 35.3 years
male: 34.3 years
female: 36.4 years (2008 est.)

Czech Republic
total: 39.8 years
male: 38.2 years
female: 41.6 years (2008 est.)

Denmark
total: 40.3 years
male: 39.4 years
female: 41.2 y