Bhutan
males age 16-49: 153,985
females age 16-49: 140,437 (2010 est.)
Bolivia
males age 16-49: 1,714,438
females age 16-49: 1,959,763 (2010 est.)
Bosnia and Herzegovina
males age 16-49: 980,425
females age 16-49: 948,791 (2010 est.)
Botswana
males age 16-49: 347,070
females age 16-49: 315,743 (2010 est.)
Brazil
males age 16-49: 38,518,822
females age 16-49: 44,560,717 (2010 est.)
British Virgin Islands
males age 16-49: 6,028
females age 16-49: 5,778 (2010 est.)
Brunei
males age 16-49: 93,809
females age 16-49: 97,345 (2010 est.)
Bulgaria
males age 16-49: 1,337,201
females age 16-49: 1,360,039 (2010 est.)
Burkina Faso
males age 16-49: 2,280,776
females age 16-49: 2,278,474 (2010 est.)
Burma
males age 16-49: 10,281,131
females age 16-49: 10,988,695 (2010 est.)