Beatrix (Beatrix Wilhelmina Armgard, Dutch pronunciation: [ˈbeːjaːtrɪks ˌʋɪlɦɛlˈminaː ˈʔɑr(ə)mɡɑrt]; born 31 January 1938) is a member of the Dutch royal house who reigned as Queen of the Netherlands from 1980 until her abdication in 2013. On Koninginnedag (Queen's Day), 30 April 2013, Beatrix abdicated in favour of her eldest son, Willem-Alexander. At the time of her abdication at age 75, Beatrix was the oldest reigning monarch in the country's history.