Sudan
17 years of age; universal
Suriname
18 years of age; universal
Swaziland
18 years of age
Sweden
18 years of age; universal
Switzerland
18 years of age; universal
Syria
18 years of age; universal
Taiwan
20 years of age; universal
Tajikistan
18 years of age; universal
Tanzania
18 years of age; universal
Thailand
18 years of age; universal and compulsory