Question: Which poet published their debut work later in life, John Millington Synge or Harriet Doerr?

Context articles: Riders to the Sea (opera)
John Millington Synge
Denis Johnston
Señora Carrar's Rifles
Harriet Doerr
Golden Boy of the Blue Ridge
Deirdre of the Sorrows
The Playboy of the Western World (film)
Riders to the Sea
The Playboy of the Western World

Riders to the Sea is a short one-act opera by Ralph Vaughan Williams, based on the play of the same name by John Millington Synge.
 The composer completed the score in 1927, but it was not premiered until 1 December 1937, at the Royal College of Music, London.
 The opera remained largely the province of students and amateurs until it entered the repertoire of Sadler's Wells in 1953.
Edmund John Millington Synge ( ; 16 April 1871 – 24 March 1909) was an Irish playwright, poet, prose writer, travel writer and collector of folklore.
 He was a key figure in the Irish Literary Revival and was one of the co-founders of the Abbey Theatre.
 He is best known for his play "The Playboy of the Western World", which caused riots in Dublin during its opening run at the Abbey Theatre.
(William) Denis Johnston (18 June 1901 – 8 August 1984) was an Irish writer.
 Born in Dublin, he wrote mostly plays, but also works of literary criticism, a book-length biographical essay of Jonathan Swift, a memoir and an eccentric work on cosmology and philosophy.
 He also worked as a war correspondent, and as both a radio and television producer for the BBC.
 His first play, "The Old Lady Says "No!""
, helped establish the worldwide reputation of the Dublin Gate Theatre; his second, "The Moon in the Yellow River", has been performed around the globe in numerous productions featuring such actors as Jack Hawkins, Claude Rains and Errol Flynn, although not all in the same production.
 He played a role in the 1935 film version of John Millington Synge's "Riders to the Sea".
Señora Carrar's Rifles (German: "Die Gewehre der Frau Carrar" ) is a one-act play by the twentieth-century German dramatist Bertolt Brecht, written in collaboration with Margarete Steffin.
 It is a modern version of the Irish dramatist John Millington Synge's play "Riders to the Sea" (1904).
 The play's setting is re-located to Spain during the height of the Civil War.
 Teresa Carrar, the mother, wants to protect her children but ends up fighting on the side of the oppressed.
 Brecht wrote it in 1937 and it received its first theatrical production in the same year, opening in Paris on 16 October.
 This production was directed by Slatan Dudow and Helene Weigel played Señora Carrar.
Harriet Huntington Doerr (April 8, 1910 – November 24, 2002) was an American author whose debut novel was published at the age of 74.
Golden Boy of the Blue Ridge is a musical based on the Irish classic "Playboy of the Western World" by John Millington Synge.
 The music was written by Peter Mills with a book by Peter Mills and Cara Reichel.
 The story has been transplanted from rural Ireland to 1930s Appalachia and set to a bluegrass-flavored score.
 It was first presented by Prospect Theater Company at the 59E59 Theaters in New York City April 11 - May 3, 2009.
Deirdre of the Sorrows is a three-act play written by Irish playwright John Millington Synge, first performed at the Abbey Theatre by the Irish National Theatre Society in 1910.
 The play is based on Irish mythology, in particular the myths concerning Deirdre and Conchobar.
 The work was unfinished at the author's death in 1909, but was completed by William Butler Yeats and Synge's fiancée, Molly Allgood.
The Playboy of the Western World is a 1962 film version of the 1907 play written by John Millington Synge.
 It was directed and co-written by Brian Desmond Hurst and stars Gary Raymond and Siobhán McKenna.
 Filmed in County Kerry, the film features many of the Abbey Players.
 The film was produced by the Four Provinces company created in 1952 by Hurst and Michael Morris, 3rd Baron Killanin who had previously produced John Ford’s "The Rising of the Moon" and "Gideon's Day".
Riders to the Sea is a play written by Irish Literary Renaissance playwright John Millington Synge.
 It was first performed on 25 February 1904 at the Molesworth Hall, Dublin, by the Irish National Theater Society.
 A one-act tragedy, the play is set in the Aran Islands, Inishmaan, and like all of Synge's plays it is noted for capturing the poetic dialogue of rural Ireland.
 The plot is based not on the traditional conflict of human wills but on the hopeless struggle of a people against the impersonal but relentless cruelty of the sea.
The Playboy of the Western World is a three-act play written by Irish playwright John Millington Synge and first performed at the Abbey Theatre, Dublin, on 26 January 1907.
 It is set in Michael James Flaherty's public house in County Mayo (on the west coast of Ireland) during the early 1900s.
 It tells the story of Christy Mahon, a young man running away from his farm, claiming he killed his father.