Who is older, Bob Bryan or Mariaan de Swardt?
Mariaan de Swardt Mariaan de Swardt (born 18 March 1971) is a former tennis player from South Africa, who played as a professional from 1988 to 2001. She twice represented her native country at the Summer Olympics, in 1992 and 1996, and was a member of the South African Fed Cup Team in 1992 and 1994–1997. In 2006, de Swardt became a U.S. citizen.
Jan de Jong Jan de Jong (1942 - ca. 28 April 2009) was the ice master of the Thialf skating stadium in Heerenveen, Netherlands. De Jong was responsible for the ice in the pre-eminent Dutch skating rink from 1967 when it opened as an outdoor 400-metre oval (the first with a concrete floor under the ice), and then from 1986 on, when Thialf became the first indoor ice stadium in the world, until his retirement in 2000, when he was succeeded by Beert Boomsma.