| Rank | Country | Median age |
210 | Gaza Strip | 
total: 17.4 years
male: 17.2 years
female: 17.5 years (2009 est.) |
45 | Georgia |
total: 38.6 years
male: 36.1 years
female: 41 years (2009 est.) |
3 | Germany |
total: 43.8 years
male: 42.6 years
female: 45.2 years (2009 est.) |
173 | Ghana |
total: 20.7 years
male: 20.5 years
female: 21 years (2009 est.) |
23 | Gibraltar |
total: 40.5 years
male: 39.9 years
female: 41 years (2009 est.) |
10 | Greece |
total: 41.8 years
male: 40.7 years
female: 42.9 years (2009 est.) |
72 | Greenland |
total: 33.5 years
male: 34.9 years
female: 31.9 years (2009 est.) |
149 | Grenada |
total: 22.8 years
male: 23.3 years
female: 22.3 years (2009 est.) |
100 | Guam |
total: 29.1 years
male: 28.8 years
female: 29.4 years (2009 est.) |
180 | Guatemala |
total: 19.4 years
male: 18.9 years
female: 20 years (2009 est.) |
6 | Guernsey |
total: 42.5 years
male: 41.4 years
female: 43.4 years (2009 est.) |
198 | Guinea |
total: 18.5 years
male: 18.2 years
female: 18.7 years (2009 est.) |
181 | Guinea-Bissau |
total: 19.3 years
male: 18.7 years
female: 19.8 years (2009 est.) |
104 | Guyana |
total: 28.7 years
male: 28.2 years
female: 29.2 years (2009 est.) |
178 | Haiti |
total: 20.2 years
male: 19.8 years
female: 20.7 years (2009 est.) |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) | void |
177 | Honduras |
total: 20.3 years
male: 20 years
female: 20.7 years (2009 est.) |
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