Italy
males age 16-49: 13,705,846
females age 16-49: 12,929,946 (2010 est.)
Jamaica
males age 16-49: 712,627
females age 16-49: 730,845 (2010 est.)
Japan
males age 16-49: 27,461,338
females age 16-49: 26,478,466 (2010 est.)
Jordan
males age 16-49: 1,646,215
females age 16-49: 1,579,268 (2010 est.)
Kazakhstan
males age 16-49: 4,176,999
females age 16-49: 4,202,422 (2010 est.)
Kenya
males age 16-49: 9,525,556
females age 16-49: 9,242,381 (2010 est.)
Kiribati
males age 16-49: 24,734 (2010 est.)
Korea, North
males age 16-49: 6,132,987
females age 16-49: 6,119,405 (2010 est.)
Korea, South
males age 16-49: 13,274,442
females age 16-49: 12,542,699 (2010 est.)
Kuwait
males age 16-49: 1,131,529
females age 16-49: 612,126 (2010 est.)