Bolivia
males age 16-49: 2,415,712
females age 16-49: 2,482,359 (2010 est.)
Bosnia and Herzegovina
males age 16-49: 1,194,832
females age 16-49: 1,156,698 (2010 est.)
Botswana
males age 16-49: 543,097
females age 16-49: 520,896 (2010 est.)
Brazil
males age 16-49: 52,942,805
females age 16-49: 53,038,688 (2010 est.)
British Virgin Islands
males age 16-49: 7,230 (2010 est.)
Brunei
males age 16-49: 111,166
females age 16-49: 115,071 (2010 est.)
Bulgaria
males age 16-49: 1,660,930
females age 16-49: 1,646,170 (2010 est.)
Burkina Faso
males age 16-49: 3,608,963 (2010 est.)
Burma
males age 16-49: 14,558,921
females age 16-49: 14,539,703 (2010 est.)
Burundi
males age 16-49: 2,099,541
females age 16-49: 2,118,918 (2010 est.)