Question: Who is younger, John Duncan Macfarlane or Andrés Manuel Del Río?

John Duncan MacFarlane
John Duncan MacFarlane (July 27, 1892 – December 8, 1982) was a Scottish-born farmer and political figure in Saskatchewan.
He represented Melfort from 1934 to 1938 as a Liberal.
He was born in Gargunnock and was educated in Scotland.
He later worked for a law office in Stirling.
In 1910, MacFarlane came to Canada, where he worked on farms and eventually earned his engineer's certificate.
He graduated from the University of Saskatchewan in agriculture.
MacFarlane served with the Royal Canadian Engineers and then with the Royal Flying Corps during World War I.
After the war, he worked for the Soldier Settlement Board for three years.
MacFarlane then settled on a farm near Carlea, Saskatchewan, where he raised Clydesdale horses, Shorthorn cattle, Yorkshire pigs, Shropshire sheep and Barred Rock chickens.
He also served on the Alysham School Board.
In 1920, he married Jean Gray.
MacFarlane was defeated by Oakland Woods Valleau when he ran for reelection in 1938.
He was a director for the United Grain Growers from 1947 to 1968 and was president of the Saskatchewan Registered Seed Growers plant at Moose Jaw.
From 1930 to 1933, he was president of the Saskatchewan Agricultural Societies Association.
MacFarlane was named to the Saskatchewan Agricultural Hall of Fame in 1979.
Hippolyte-Victor Collet-Descotils
Hippolyte- Victor Collet- Descotils( November 21, 1773 in Caen – December 6, 1815 in Paris) was a French chemist.
He studied in the École des Mines de Paris, and was a student and friend of Louis Nicolas Vauquelin.
He is best known for confirming the discovery of chromium by Vauquelin, and for independently discovering iridium in 1803.
In 1806, Collet- Descotils misidentified erythronium, a new element discovered in Mexico by Andrés Manuel del Río, thinking that it was chromium.
This resulted in Alexander von Humboldt rejecting Del Río's discovery.
The same element was rediscovered thirty years later in Sweden and renamed as vanadium.
In 1815, a few months before his death, he got the position of director of École des Mines de Paris, in charge of transferring the school to a new building.
He is buried in the 10th Division of the Père Lachaise Cemetery of Paris.
Nils Gabriel Sefström
Nils Gabriel Sefström( 2 June 1787 – 30 November 1845) was a Swedish chemist.
Sefström was a student of Berzelius and, when studying the brittleness of steel in 1830, he rediscovered a new chemical element, to which he gave the name vanadium.
Vanadium was first discovered by the Spanish- Mexican mineralogist Andrés Manuel del Río in 1801.
He named it erythronium.
Friedrich Wöhler later confirmed that vanadium and erythronium were the same substance.
Sefström was member of the Royal Swedish Academy of Sciences from 1815.
The Spitzbergen glacier Sefströmbreen, and the mountain ridge of Sefströmkammen, are named after him.
Andrés Manuel del Río
Andrés Manuel del Río y Fernández( 10 November 1764 – 23 March 1849) was a Spanish – Mexican scientist, naturalist and engineer who discovered compounds of" vanadium" in 1801.
He proposed that the element be given the name" panchromium", or later," erythronium", but his discovery was not credited at the time, and his names were not used.
John Duncan (harpist)
John Duncan( 1904–1998) was a 20th- century harpist.
John Duncan (painter)
John Duncan( 1866–1945) was a Scottish painter.
Héctor Manuel del Villar Martínez
Héctor Manuel del Villar Martínez( 23 September 1937 – 5 February 2017) was a Mexican politician affiliated with the Institutional Revolutionary Party.
He served as Municipal President of Aguascalientes from 1987 to 1989.
John Duncan (botanist)
John Duncan( 19 December 1794 – 9 August 1881) was a Scottish weaver and botanist.
José Manuel del Río
José Manuel del Río Virgen( born January 8, 1954) is a Mexican politician affiliated with Convergence who currently serves in the lower house of the Mexican Congress.
John Duncan (traveller in Africa)
John Duncan( 1805–1849) was a Scottish traveller in Africa.

Answer: John Duncan Macfarlane