| Rank | Country | Median age |
54 | Montenegro | total: 37.8 years male: 36.5 years female: 39.2 years (2011 est.) |
104 | Montserrat | total: 29.6 years male: 29.2 years female: 30.1 years (2011 est.) |
124 | Morocco | total: 26.9 years male: 26.3 years female: 27.4 years (2011 est.) |
221 | Mozambique | total: 16.8 years male: 16.1 years female: 17.4 years (2011 est.) |
170 | Namibia | total: 21.7 years male: 21.7 years female: 21.8 years (2011 est.) |
147 | Nauru | total: 24.2 years male: 24.4 years female: 23.9 years (2011 est.) |
| Navassa Island | void |
171 | Nepal | total: 21.6 years male: 20.7 years female: 22.5 years (2011 est.) |
22 | Netherlands | total: 41.1 years male: 40.3 years female: 41.9 years (2011 est.) |
98 | New Caledonia | total: 30.1 years male: 29.6 years female: 30.7 years (2011 est.) |
60 | New Zealand | total: 37 years male: 36.2 years female: 37.8 years (2011 est.) |
155 | Nicaragua | total: 22.9 years male: 22.1 years female: 23.7 years (2011 est.) |
225 | Niger | total: 15.2 years male: 15 years female: 15.4 years (2011 est.) |
192 | Nigeria | total: 19.2 years male: 19.2 years female: 19.3 years (2011 est.) |
| Niue | void |
| Norfolk Island | void |
100 | Northern Mariana Islands | total: 30 years male: 29.8 years female: 30.1 years (2011 est.) |