Belarus
males age 16-49: 2,491,643
females age 16-49: 2,528,779 (2008 est.)
Belgium
males age 16-49: 2,407,128
females age 16-49: 2,340,039 (2008 est.)
Belize
males age 16-49: 74,605
females age 16-49: 72,926 (2008 est.)
Benin
males age 16-49: 1,908,457
females age 16-49: 1,882,421 (2008 est.)
Bermuda
males age 16-49: 15,623 (2008 est.)
Bhutan
males age 16-49: 190,104
females age 16-49: 167,289 (2008 est.)
Bolivia
males age 16-49: 2,295,746
females age 16-49: 2,366,828 (2008 est.)
Bosnia and Herzegovina
males age 16-49: 1,212,007
females age 16-49: 1,170,645 (2008 est.)
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.)