| Country | Sovereign | Born | Acceded | ||
| Liechtenstein | Prince Franz Joseph II | 16 August | 1906 | 25 July | 1938 |
| Monaco | Prince Rainier III | 31 May | 1923 | 9 May | 1949 |
| 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 |
| Luxembourg | Grand Duke Jean | 5 January | 1921 | 12 November | 1964 |
| Denmark | Queen Margrethe II | 16 April | 1940 | 14 January | 1972 |
| Sweden | King Carl XVI Gustaf | 30 April | 1946 | 19 September | 1973 |
| Spain | King Juan Carlos I | 5 January | 1938 | 22 November | 1975 |
| Netherlands | Queen Beatrix | 31 January | 1938 | 30 April | 1980 |
25 Years Later
25 Years Earlier
European Sovereigns
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