Question: Who is older, Bob Bryan or Mariaan de Swardt?

Documents:
source: Mariaan de Swardt
text: 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.

source: Bob Bryan
text: Bob Bryan Robert Charles Bryan (born April 29, 1978) is an American male professional tennis player. He has won twenty-three Grand Slam titles: 16 in men's doubles and 7 in mixed doubles. He turned professional in 1998. With his twin brother Mike, he has been world No. 1 doubles player for much of the last several years, first achieving the top ranking in September 2003. The brothers were named ATP Team of the Decade for 2000–2009. The brothers became the second men's doubles team to complete the career golden slam at the 2012 Summer Olympics.

source: 1998 Boston Cup – Singles
text: 1998 Boston Cup – Singles Mariaan de Swardt won in the final 3–6, 7–6, 7–5 against Barbara Schett.

source: 1998 Boston Cup – Doubles
text: 1998 Boston Cup – Doubles Lisa Raymond and Rennae Stubbs won in the final 6–4, 6–4 against Mariaan de Swardt and Mary Joe Fernández.

source: 1997 Welsh International Open – Doubles
text: 1997 Welsh International Open – Doubles Katrina Adams and Mariaan de Swardt were the defending champions but did not compete that year.

source: 1999 Wimbledon Championships – Women's Doubles
text: 1999 Wimbledon Championships – Women's Doubles The 1999 Wimbledon Championships – Women's Doubles was the women's doubles event of the hundred-and-thirteenth edition of Wimbledon, the third Grand Slam of the year, the most prestigious tournament on grass courts, and the oldest tennis tournament in the world. Martina Hingis and Jana Novotná were the defending champions but only Novotná competed that year with Natasha Zvereva. Novotná and Zvereva lost in the semifinals to Mariaan de Swardt and Elena Tatarkova.

source: 2006 Tennis Channel Open – Doubles
text: 2006 Tennis Channel Open – Doubles Bob Bryan and Bob Bryan were the defending champions. They successfully defended their title, defeating Jaroslav Levinský and Robert Lindstedt 6–3, 6–2 in the final.

source: 1997 Challenge Bell – Doubles
text: 1997 Challenge Bell – Doubles Debbie Graham and Brenda Schultz-McCarthy were the defending champions, but decided not to compete together. Graham partnered with Mariaan de Swardt, but lost in the semifinals to Alexandra Fusai and Nathalie Tauziat. Schultz-McCarthy partnered with Rebecca Jensen, but lost in the first round to Patricia Hy-Boulais and Chanda Rubin.

source: 2000 Australian Open – Mixed Doubles
text: 2000 Australian Open – Mixed Doubles Mariaan de Swardt and David Adams were the defending champions but only Adams competed that year with Kristie Boogert.

source: 1996 Toray Pan Pacific Open – Doubles
text: 1996 Toray Pan Pacific Open – Doubles Gigi Fernández and Natasha Zvereva were the defending champions and won in the final 7–6, 6–3 against Mariaan de Swardt and Irina Spîrlea.

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Answer: Mariaan de Swardt