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
Australia
18 years of age; universal and compulsory
Austria
18 years of age; universal
Azerbaijan
18 years of age; universal
Bahamas, The
18 years of age; universal
Bahrain
18 years of age; universal
Bangladesh
18 years of age; universal