The 2001 CIA World Factbook

by United States. Central Intelligence Agency

Anguilla:
18 years of age; universal

Antigua and Barbuda:
18 years of age; universal

Argentina:
18 years of age; universal and mandatory

Armenia:
18 years of age; universal

Aruba:
18 years of age; universal

Australia:
18 years of age; universal and compulsory

Austria:
19 years of age; universal; compulsory for presidential
elections

Azerbaijan:
18 years of age; universal

Bahamas, The:
18 years of age; universal

Bahrain:
none