Botswana
males age 16-49: 487,853
females age 16-49: 464,278 (2008 est.)
Brazil
males age 16-49: 52,449,957
females age 16-49: 52,375,921 (2008 est.)
British Virgin Islands
males age 16-49: 7,101 (2008 est.)
Brunei
males age 16-49: 108,356
females age 16-49: 110,153 (2008 est.)
Bulgaria
males age 16-49: 1,701,979
females age 16-49: 1,691,092 (2008 est.)
Burkina Faso
males age 16-49: 3,364,288 (2008 est.)
Burma
males age 16-49: 13,402,788
females age 16-49: 13,437,042 (2008 est.)
Burundi
males age 16-49: 1,878,544
females age 16-49: 1,851,676 (2008 est.)
Cambodia
males age 16-49: 3,759,034
females age 16-49: 3,784,333 (2008 est.)
Cameroon
males age 16-49: 4,321,175
females age 16-49: 4,228,625 (2008 est.)