Ireland
males age 16-49: 857,162
females age 16-49: 854,416 (2009 est.)
Isle of Man
males age 16-49: 14,691
females age 16-49: 14,338 (2009 est.)
Israel
males age 16-49: 1,474,966
females age 16-49: 1,404,712 (2009 est.)
Italy
males age 16-49: 11,197,487
females age 16-49: 10,574,250 (2009 est.)
Jamaica
males age 16-49: 573,520
females age 16-49: 586,426 (2009 est.)
Japan
males age 16-49: 22,757,136
females age 16-49: 21,920,703 (2009 est.)
Jersey
males age 16-49: 16,920
females age 16-49: 16,826 (2009 est.)
Jordan
males age 16-49: 1,593,919
females age 16-49: 1,382,097 (2009 est.)
Kazakhstan
males age 16-49: 2,888,931
females age 16-49: 3,550,014 (2009 est.)
Kenya
males age 16-49: 5,935,480
females age 16-49: 5,662,755 (2009 est.)