Russia
males age 16-49: 36,219,908
females age 16-49: 37,019,853 (2008 est.)
Rwanda
males age 16-49: 2,430,469
females age 16-49: 2,392,933 (2008 est.)
Saint Kitts and Nevis
males age 16-49: 10,095
females age 16-49: 10,081 (2008 est.)
Saint Lucia
males age 16-49: 48,358 (2008 est.)
Saint Vincent and the Grenadines
males age 16-49: 34,373 (2008 est.)
Samoa
males age 16-49: 53,417 (2008 est.)
San Marino
males age 16-49: 6,613 (2008 est.)
Sao Tome and Principe
males age 16-49: 42,340
females age 16-49: 43,781 (2008 est.)
Saudi Arabia
males age 16-49: 8,547,441
females age 16-49: 6,381,098 (2008 est.)
Senegal
males age 16-49: 2,943,619
females age 16-49: 2,955,179 (2008 est.)