Bhutan
males age 16-49: 146,063
females age 16-49: 131,193 (2008 est.)
Bolivia
males age 16-49: 1,600,219
females age 16-49: 1,815,514 (2008 est.)
Bosnia and Herzegovina
males age 16-49: 996,225
females age 16-49: 962,927 (2008 est.)
Botswana
males age 16-49: 290,093
females age 16-49: 257,700 (2008 est.)
Brazil
males age 16-49: 39,263,710
females age 16-49: 44,109,056 (2008 est.)
British Virgin Islands
males age 16-49: 5,921 (2008 est.)
Brunei
males age 16-49: 91,297
females age 16-49: 93,228 (2008 est.)
Bulgaria
males age 16-49: 1,364,029
females age 16-49: 1,401,348 (2008 est.)
Burkina Faso
males age 16-49: 2,115,948 (2008 est.)
Burma
males age 16-49: 9,031,046
females age 16-49: 9,396,547 (2008 est.)