| Age | Name | Assumed Office | Title | Country | % Correct |
|---|---|---|---|---|---|
| 16 yrs | Alfonso Xlll | 1902 | King | Spain | 100%
|
| 2 yrs | Puyi | 1908 | Emperor | China | 94%
|
| 11 yrs | Ahmad Shah Qajar | 1909 | Shah | Iran | 94%
|
| 9 yrs | Ananda Mahidol | 1935 | King | Thailand | 90%
|
| 18 yrs | Bhumibol Adulyadej | 1946 | King | Thailand | 90%
|
| 19 yrs | Norodom Sihanouk | 1941 | King | Cambodia | 87%
|
| 6 mths | Fuad ll | 1952 | King | Egypt | 87%
|
| 17 yrs | Farouk I | 1937 | King | Egypt | 87%
|
| 16 yrs | Hussein bin Talal | 1952 | King | Jordan | 87%
|
| 3 yrs | Gyanendra | 1950 | King | Nepal | 84%
|
| 17 yrs | Tribhuvan | 1923 | King | Nepal | 84%
|
| 5 yrs | Michael l | 1927 | King | Romania | 84%
|
| 18 yrs | Mihai l | 1940 | King | Romania | 84%
|
| 18 yrs | Faisal ll | 1953 | King | Iraq | 81%
|
| 6 yrs | Simeon ll | 1943 | Tsar | Bulgaria | 77%
|
| 18 yrs | Manuel ll | 1908 | King | Portugal | 77%
|
| 7 yrs | Duy Tân | 1907 | Emperor | Vietnam | 77%
|
| 16 yrs | Jigme Singye Wangchuck | 1972 | King | Bhutan | 74%
|
| 4 yrs | Tenzin Gyatso | 1940 | Dalai Lama | Tibet | 74%
|
| 18 yrs | Mswati III | 1986 | King | Eswatini | 68%
|
| 18 yrs | Iyasu V | 1913 | Emperor | Ethiopia | 61%
|
| 17 yrs | Marie-Adélaïde | 1912 | Grand Duchess | Luxembourg | 61%
|
| 19 yrs | Mohammad Zahir Shah | 1933 | King | Afghanistan | 52%
|
| 20 yrs | Baudouin | 1951 | King | Belgium | 48%
|
| 17 yrs | Peter ll | 1941 | King | Yugoslavia | 45%
|
| 3 yrs | Mwambutsa lV | 1915 | King | Burundi | 29%
|
| 18 yrs | Ntare V | 1966 | King | Burundi | 29%
|