The 2001 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