Young is born in Galgorm Castle, Ballymena, County Antrim, daughter and seventh of twelve children born to Grace Charlotte Savage, and John Young who is a prosperous unionist and high sheriff. Despite his position he is a believer in tenant rights. Her younger sister is the writer Ella Young and her brother Willie Young is secretary of the Ulster Unionist League.
Young is educated by governesses until 1884 before completing training as a teacher through Cambridge University. Young also attends Gaelic League classes in 1903 in London while visiting her sister who is living in the city at the time. After visiting the Bodleian Library she becomes committed to the study of the Irish language.
In the early 1900s Young returns to Ireland and continues her study of the Irish language in Belfast at Seán Ó Catháin‘s Irish College and in County Donegal at Coláiste Uladh in Gort an Choirce. Young also stays in Dublin and becomes friends with members of the Gaelic League and meets Margaret Dobbs. Young works with Dobbs on the Feis na nGleann (The Glens Festival), a gathering dedicated to the Irish language.
Young is not involved in nationalism though she is strongly supportive of creating and maintaining a sense of “Irishness” through language and culture. She is also a friend and patron of Roger Casement. She also works with Ellen O’Brien and contributes to O’Brien’s book, The Gaelic Church. She keeps meticulous diaries and becomes interested in Rathlin Island and the Gaelic spoken there.
Rose Young is buried in the Presbyterian churchyard at Ahoghill, County Antrim.