Kazakhstan
males age 18-49: 3,758,255
females age 18-49: 3,822,845 (2005 est.)
Kenya
males age 18-49: 7,303,153
females age 18-49: 7,083,726 (2005 est.)
Kiribati
males age 18-49: 21,938 (2005 est.)
Korea, North
males age 17-49: 5,851,801
females age 17-49: 5,850,733 (2005 est.)
Korea, South
males age 20-49: 12,483,677
females age 20-49: 12,014,462 (2005 est.)
Kuwait
males age 18-49: 864,745
females age 18-49: 467,120 (2005 est.)
Kyrgyzstan
males age 18-49: 1,193,529
females age 18-49: 1,219,080 (2005 est.)
Laos
males age 15-49: 1,500,625
females age 15-49: 1,521,116 (2005 est.)
Latvia
males age 19-49: 517,713
females age 19-49: 519,631 (2005 est.)
Lebanon
males age 18-49: 974,363
females age 18-49: 1,024,273 (2005 est.)