Romania
males age 16-49: 5,617,144
females age 16-49: 5,487,510 (2010 est.)
Russia
males age 16-49: 34,850,217
females age 16-49: 35,693,977 (2010 est.)
Rwanda
males age 16-49: 2,573,834
females age 16-49: 2,553,707 (2010 est.)
Saint Kitts and Nevis
males age 16-49: 13,510
females age 16-49: 13,075 (2010 est.)
Saint Lucia
males age 16-49: 41,177 (2010 est.)
Saint Vincent and the Grenadines
males age 16-49: 27,940 (2010 est.)
Samoa
males age 16-49: 47,423 (2010 est.)
San Marino
males age 16-49: 6,893 (2010 est.)
Sao Tome and Principe
males age 16-49: 38,211
females age 16-49: 38,929 (2010 est.)
Saudi Arabia
males age 16-49: 8,752,167
females age 16-49: 6,680,315 (2010 est.)