Bosnia and Herzegovina
males age 18-49: 910,539
females age 18-49: 881,446 (2005 est.)
Botswana
males age 18-49: 136,322
females age 18-49: 136,315 (2005 est.)
Brazil
males age 19-49: 33,119,098
females age 19-49: 38,079,722 (2005 est.)
British Virgin Islands
males age 18-49: 5,295 (2005 est.)
Brunei
males age 18-49: 85,045
females age 18-49: 77,436 (2005 est.)
Bulgaria
males age 18-49: 1,302,037
females age 18-49: 1,365,126 (2005 est.)
Burkina Faso
males age 18-49: 1,530,324 (2005 est.)
Burma
males age 18-49: 7,946,701
females age 18-49: 8,543,705 (2005 est.)
Burundi
males age 16-49: 955,616
females age 16-49: 932,767 (2005 est.)
Cambodia
males age 18-49: 1,955,141
females age 18-49: 2,048,611 (2005 est.)