Belarus
males age 18-49: 2,520,644
females age 18-49: 2,564,696 (2005 est.)
Belgium
males age 16-49: 2,436,736
females age 16-49: 2,369,463 (2005 est.)
Belize
males age 18-49: 61,201
females age 18-49: 60,048 (2005 est.)
Benin
males age 21-49: 1,295,230
females age 21-49: 1,301,936 (2005 est.)
Bermuda
males age 18-49: 15,151 (2005 est.)
Bhutan
males age 18-49: 483,860
females age 18-49: 453,683 (2005 est.)
Bolivia
males age 18-49: 1,923,234
females age 18-49: 2,007,315 (2005 est.)
Bosnia and Herzegovina
males age 18-49: 1,119,508
females age 18-49: 1,079,435 (2005 est.)
Botswana
males age 18-49: 350,649
females age 18-49: 361,642 (2005 est.)
Brazil
males age 19-49: 45,586,036
females age 19-49: 45,728,704 (2005 est.)