The 2009 CIA World Factbook

by United States. Central Intelligence Agency

Saint Vincent and the Grenadines
total: 28.9 years
male: 29 years
female: 28.9 years (2009 est.)

Samoa
total: 20.8 years
male: 21 years
female: 20.5 years (2009 est.)

San Marino
total: 41.5 years
male: 41.1 years
female: 41.9 years (2009 est.)

Sao Tome and Principe
total: 16.4 years
male: 15.9 years
female: 17 years (2009 est.)

Saudi Arabia
total: 21.6 years
male: 22.9 years
female: 19.9 years (2009 est.)

Senegal
total: 18.6 years
male: 18.4 years
female: 18.8 years (2009 est.)

Serbia
total: 41 years
male: 39.3 years
female: 42.7 years (2009 est.)

Seychelles
total: 31.4 years
male: 30.9 years
female: 32 years (2009 est.)

Sierra Leone
total: 17.5 years
male: 17.2 years
female: 17.8 years (2009 est.)

Singapore
total: 39 years
male: 38.5 years
female: 39.4 years (2009 est.)