- Who
- Queen Margrethe II
- What
- 82 yrs and 177 days year(s):day(s)
- Where
- United Kingdom ()
- When
Queen Margrethe II ( born 16 April 1940 ) and is 82 yrs old and 177 days ( on the 10th of October) took the throne on the 14th of January 1972.
ttps://people.com/royals/queen-margrethe-denmark-now-only-ruling-female-monarch-in-europe-after-queen-elizabeth-death/