Johann Wilhelm Haas
Johann Wilhelm Haas( 1649 – 1723), was a German trumpet maker and engraver.
Willi Boltze
Wilhelm Andreas" Willi" Boltze( 24 July 1904 – 25 October 1937) was a German long- distance runner.
He competed in the men's 5000 metres at the 1928 Summer Olympics.
Johann Wilhelm Sturm
Johann Wilhelm Sturm( 1808- 1865) was German botanist.
Johann Wilhelm Löbell
Johann Wilhelm Löbell( 15 September 1786 – 12 July 1863) was a German historian.
Johann Wilhelm, Duke of Saxe-Weimar
Johann Wilhelm (11 March 1530 – 2 March 1573) was a duke of Saxe-Weimar.
Johann Wilhelm Andreas Pfaff
Johann Wilhelm Andreas Pfaff( 5 December 1774 – 26 June 1835), was professor of pure and applied mathematics successively at Dorpat, Nuremberg, Würzburg and Erlangen.
He was a brother of Johann Friedrich Pfaff, a mathematician; and of Christian Heinrich Pfaff, a physician and physicist.
Irina Ilchenko
Irina Anatolyevna Ilchenko( born 3 August 1968 in Sverdlovsk), known as Irina Ilchenko or Irina Smirnova, is a Russian volleyball player.
Born in Yekaterinburg, she competed for the Soviet Union at the 1988 Summer Olympics, the Unified Team at the 1992 Summer Olympics, and Russia at the 1996 Summer Olympics.
Irina Mikhailovna Raievskya
Irina Mikhailovna Raievskya( 18 August 1892 – 22 January 1955), was a Russian and German noble.
She was Duchess of Mecklenburg by her marriage to her second husband, George, Duke of Mecklenburg, who was the head of the House of Mecklenburg- Strelitz from 1934 until his death in 1963.
Irina is the great- grandmother of Sophie, Princess of Prussia, wife of Georg Friedrich, Prince of Prussia, current head of the House of Hohenzollern.
Karl Strehl
Karl Wilhelm Andreas Strehl( April 30, 1864 — June 14, 1940) was a German physicist, author and mathematician.
He is notable for the Strehl ratio, a widely used measurement for the optical quality of an imaging system.
Wilhelm Hill
Johann Wilhelm Hill( 28 March 1838 – 6 June 1902) was a German pianist and composer.

Question: Who is older, Johann Wilhelm Andreas Pfaff or Irina Mikhailovna Raievskya?
Answer: Johann Wilhelm Andreas Pfaff