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

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

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.

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.

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

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.

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.

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.

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.

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

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.

Supporting paragraphs: Bob Bryan Mariaan de Swardt
Answer: Mariaan de Swardt