Four of them ascended to the throne due to the abdication of their predecessor.
Arrange based on the length of their reign:
- King Carl XVI Gustaf of Sweden. Age: 79. Birthday: April 30, 1946. Length of reign: 52 years. Ascended to the throne on September 15, 1973, following the passing of his grandfather, King Gustaf VI Adolf. House: Bernadotte. Heir Apparent: Crown Princess Victoria
- King Harald V of Norway. Age: 89. Birthday: February 21, 1937. Length of reign: 35 years. Ascended to the throne on January 17, 1991, following the passing of his father, King Olav V. House: Glücksburg. Heir Apparent: Crown Prince Haakon
- King Willem-Alexander of the Netherlands. Age: 58. Birthday: April 27, 1967. Length of reign: 12 years. Ascended to the throne on April 30, 2013, upon the abdication of his mother, Queen Beatrix. Heir Apparent: Catharina-Amalia, the Princess of Orange. House: Orange-Nassau
- King Philippe of the Belgians. Age: 65. Birthday: April 15, 1960. Length of reign: 12 years. Ascended to the throne on July 21, 2013, upon the abdication of his father, King Albert II. Heir Apparent: Princess Elisabeth, the Duchess of Brabant. House: Belgium (formerly Saxe-Coburg and Gotha)
- King Felipe VI of Spain. Age: 58. Birthday: January 30, 1968. Length of reign: 11 years. Ascended to the throne on June 19, 2014, upon the abdication of his father, King Juan Carlos I. Heir Presumptive: Leonor, the Princess of Asturias. House: Bourbon
- King Charles III of the United Kingdom. Age: 77. Birthday: November 14, 1948. Length of reign: 3 years. Ascended to the throne on September 8, 2022, following the passing of his mother, Queen Elizabeth II. Heir Apparent: William, the Prince of Wales. House: Windsor (formerly Saxe-Coburg and Gotha)
- King Frederik X of Denmark. Age: 57. Birthday: May 26, 1968. Length of reign: 2 years. Ascended to the throne on January 14, 2024, upon the abdication of his mother, Queen Margrethe II. Heir Apparent: Crown Prince Christian. House: Glücksburg
