The 2006 CIA World Factbook

by United States. Central Intelligence Agency

Namibia
18 years of age; universal

Nauru
20 years of age; universal and compulsory

Nepal
18 years of age; universal

Netherlands
18 years of age; universal

Netherlands Antilles
18 years of age; universal

New Caledonia
18 years of age; universal

New Zealand
18 years of age; universal

Nicaragua
16 years of age; universal

Niger
18 years of age; universal

Nigeria
18 years of age; universal