List of selected countries sorted by median age, from youngest to oldest. The median age is the age at which half the population is older and half is younger.

1. Pakistan: 23.8
2. India: 28.7
3. Turkey: 32.8
4. Kosovo: 33.2
5. Albania: 36.4
6. Iceland: 38.1
7. Moldova: 38.7
8. United States: 38.9
9. Cyprus: 39.0
10. Ireland: 39.1
11. North Macedonia: 39.3
12. Luxembourg: 39.5
13. Montenegro: 39.6
14. Norway: 39.8
15. Russia: 40.3
16. United Kingdom: 40.6
17. Belarus: 40.9
18. Sweden: 41.1
19. Ukraine: 41.2
20. Slovakia: 41.8
21. Belgium: 41.9
22. Poland: 41.9
23. France: 42.0
24. Denmark: 42.2
25. Malta: 42.5
26. Romania: 42.5
27. Switzerland: 42.7
28. Netherlands: 42.8
29. Bosnia and Herzegovina: 43.3
30. Czech Republic: 43.3
31. Serbia: 43.4
32. Finland: 43.5
33. Hungary: 43.7
34. Liechtenstein: 43.7
35. Croatia: 44.0
36. Estonia: 44.4
37. Austria: 44.5
38. Lithuania: 44.5
39. Latvia: 44.6
40. Spain: 44.9
41. Bulgaria: 45.0
42. Slovenia: 45.0
43. San Marino: 46.0
44. Portugal: 46.2
45. Greece: 46.5
46. Germany: 47.8
47. Andorra: 48.1
48. Italy: 48.2
49. Japan: 49.5
50. Monaco: 56.2

Assembled from WikiPedia, CIA dot gov, worlddata dot org, ourworldindata dot org, and other sources.