| Country | Sovereign | Born | Acceded | ||
| Luxembourg | Grand Duchess Charlotte | 23 January | 1896 | 14 January | 1919 |
| Liechtenstein | Prince Franz Joseph II | 16 August | 1906 | 25 July | 1938 |
| Greece | King Paul I | 14 December | 1901 | 1 April | 1947 |
| Denmark | King Frederik IX | 11 March | 1899 | 20 April | 1947 |
| Netherlands | Queen Juliana | 30 April | 1909 | 6 September | 1948 |
| Monaco | Prince Rainier III | 31 May | 1923 | 9 May | 1949 |
| Sweden | King Gustaf VI Adolf | 11 November | 1882 | 29 October | 1950 |
| Belgium | King Baudouin I | 7 September | 1930 | 16 July | 1951 |
| United Kingdom | Queen Elizabeth II | 21 April | 1926 | 6 February | 1952 |
| Norway | King Olav V | 2 July | 1903 | 21 September | 1957 |
25 Years Later
25 Years Earlier
European Sovereigns
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