The 2008 CIA World Factbook

by United States. Central Intelligence Agency

Albania
18 years of age; universal

Algeria
18 years of age; universal

American Samoa
18 years of age; universal

Andorra
18 years of age; universal

Angola
18 years of age; universal

Anguilla
18 years of age; universal

Antigua and Barbuda
18 years of age; universal

Argentina
18 years of age; universal and compulsory

Armenia
18 years of age; universal

Aruba
18 years of age; universal