Median age (in years)

18.0 Gaza Strip

21.9 West Bank

23.5 Syria

30.4 Israel

31.0 World

33.7 Lebanon

38.5 USA

40.3 Russia

40.6 UK

41.2 Ukraine

41.7 France

42.7 Switzerland

44.0 EU

47.8 Germany

Src. CIA World Factbook

https://www.cia.gov/the-world-factbook/