Romania
males age 16-49: 4,572,017
females age 16-49: 4,644,474 (2008 est.)
Russia
males age 16-49: 21,488,878
females age 16-49: 28,760,976 (2008 est.)
Rwanda
males age 16-49: 1,404,066
females age 16-49: 1,403,700 (2008 est.)
Saint Kitts and Nevis
males age 16-49: 8,064
females age 16-49: 8,464 (2008 est.)
Saint Lucia
males age 16-49: 38,660 (2008 est.)
Saint Vincent and the Grenadines
males age 16-49: 28,518 (2008 est.)
Samoa
males age 16-49: 42,359 (2008 est.)
San Marino
males age 16-49: 5,345 (2008 est.)
Sao Tome and Principe
males age 16-49: 33,735
females age 16-49: 36,779 (2008 est.)
Saudi Arabia
males age 16-49: 7,398,417
females age 16-49: 5,525,357 (2008 est.)