| Rank | Country | Median age |
96 | Kazakhstan |  total: 29.6 years male: 28.1 years female: 31.3 years (2009 est.) |
193 | Kenya |  total: 18.7 years male: 18.6 years female: 18.8 years (2009 est.) |
169 | Kiribati |  total: 20.8 years male: 20.3 years female: 21.3 years (2009 est.) |
73 | Korea, North |  total: 33.5 years male: 32.1 years female: 34.9 years (2009 est.) |
54 | Korea, South |  total: 37.3 years male: 36 years female: 38.5 years (2009 est.) |
126 | Kosovo |  total: 25.9 years male: 25.4 years female: 26.4 years (2009 est.) |
124 | Kuwait |  total: 26.2 years male: 28.1 years female: 22.7 years (2009 est.) |
139 | Kyrgyzstan |  total: 24.4 years male: 23.6 years female: 25.3 years (2009 est.) |
182 | Laos |  total: 19.3 years male: 19 years female: 19.6 years (2009 est.) |
29 | Latvia |  total: 40.1 years male: 37.1 years female: 43.3 years (2009 est.) |
97 | Lebanon |  total: 29.3 years male: 28 years female: 30.5 years (2009 est.) |
165 | Lesotho |  total: 21.4 years male: 20.9 years female: 22 years (2009 est.) |
202 | Liberia |  total: 18 years male: 17.9 years female: 18.2 years (2009 est.) |
145 | Libya |  total: 23.9 years male: 24 years female: 23.8 years (2009 est.) |
19 | Liechtenstein |  total: 41 years male: 40.4 years female: 41.5 years (2009 est.) |
39 | Lithuania |  total: 39.3 years male: 36.8 years female: 41.9 years (2009 est.) |
40 | Luxembourg |  total: 39.2 years male: 38.2 years female: 40.2 years (2009 est.) |