Question: Who is older, Robert Lindstedt or Piet Norval?

full_context: Document 1: Boris Becker: Boris Franz Becker (] ; born 22 November 1967) is a German former world No. 1 professional tennis player. He was successful from the start of his career, winning the first of his six major singles titles aged 17. He also won five year-end championships, 13 Masters Series titles, and an Olympic gold medal in doubles. "Tennis" magazine ranked him the 11th best male player of the period 1965–2005.
Document 2: Horia Tecău: Horia Tecău (] ; born January 19, 1985) is a Romanian tennis player currently ranked World No. 9 in doubles. He turned pro in 2003 and reached the men's doubles finals of the 2010, 2011 and 2012 Wimbledon Championships with Robert Lindstedt before winning it in 2015 with Jean-Julien Rojer, with whom he also won the 2017 US Open. Tecău also won the 2012 Australian Open mixed doubles title with Bethanie Mattek-Sands and the 2015 ATP World Tour Finals with Rojer.
Document 3: 1994 Grand Prix Hassan II – Doubles: Mike Bauer and Piet Norval were the defending champions, but did not participate this year.
Document 4: Robert Lindstedt: Robert Lindstedt (born 19 March 1977) is a Swedish professional tennis player, who turned pro in 1998, and is a doubles specialist. His biggest title has been the 2014 Australian Open with partner Łukasz Kubot. He is also a three-time Wimbledon finalist with former partner Horia Tecău.
Document 5: Łukasz Kubot: Łukasz Kubot (; born May 16, 1982) is a Polish professional tennis player. Kubot is a doubles specialist and won the 2014 Australian Open men's doubles title with Robert Lindstedt as well as the 2017 Wimbledon men's doubles title with Marcelo Melo. He has also had success in singles, achieving a career-high singles ranking of World No. 41 in April 2010 and reaching the quarterfinals of the 2013 Wimbledon Championships. In 2013 he was awarded the Gold Cross of Merit by Polish President Bronisław Komorowski.
Document 6: Pete Sampras: Pete Sampras (born August 12, 1971) is a retired American tennis player widely regarded as one of the greatest in the history of the sport. He was a right-handed player with a single-handed backhand and a precise and powerful serve that earned him the nickname "Pistol Pete". His professional career began in 1988 and ended at the 2002 US Open, which he won, defeating rival Andre Agassi in the final.
Document 7: 2010 Pilot Pen Tennis – Men's Doubles: Julian Knowle and Jürgen Melzer were the defending champions, but Melzer chose not to participate this year.As a result, Knowle partnered with Andy Ram, but they lost to Robert Lindstedt and Horia Tecău in the semifinals. Lindstedt and Tecău went on to win the tournament, after defeating Rohan Bopanna and Aisam-ul-Haq Qureshi in the final 6–4, 7–5.
Document 8: 2015 Australian Open – Men's Doubles: Łukasz Kubot and Robert Lindstedt were the defending champions, but chose not to participate together. Kubot teamed up with Jérémy Chardy, but lost in the second round to Alex Bolt and Andrew Whittington. Lindstedt played alongside Marcin Matkowski, but lost in the second round to Jonathan Erlich and Treat Huey.
Document 9: 2013 Topshelf Open – Men's Doubles: Robert Lindstedt and Horia Tecău were the defending champions but Lindstedt decided not to participate.<br>
Document 10: Bent-Ove Pedersen: Bent-Ove Pedersen (born 11 July 1967 in Oslo) is a former tennis player from Norway, who turned professional in 1992. He spent several years playing tennis at Berkeley in California. The right-hander represented his native country in the doubles competition at the 1992 Summer Olympics in Barcelona, where he partnered Christian Ruud. The pair was defeated in the first round by South Africa's eventual runners-up Wayne Ferreira and Piet Norval. Pedersen reached his highest singles ATP-ranking on 13 September 1993, when he became the number 366 of the world. He was in quarterfinal in US Open doubles, 1991, partnering Matt Lucena from the US. He became the number 78 on the doubles ranking 30. August 1993.
Document 11: Andy Norval: Born in South Australia, where, as a youth, he played Australian Rules football, Norval began his rugby league career in the Newcastle competition before moving to Sydney where he played 105 matches with the Eastern Suburbs club in the years (1934–41). Norval a lock forward played an integral role in an Eastern Suburbs sides that swept all before them during that period, winning 4 premierships as well as finishing runners-up on three other occasions.
Document 12: Marc Rosset: Marc Rosset (born 7 November 1970) is a former professional tennis player from Switzerland who is best remembered for winning the men's singles gold medal at the 1992 Olympic Games. He also won one Grand Slam doubles title at the French Open in 1992 partnering compatriot Jakob Hlasek.
Document 13: Stefan Edberg: Stefan Bengt Edberg (] ; born 19 January 1966) is a Swedish former world no. 1 professional tennis player (in both singles and doubles). A major proponent of the serve-and-volley style of tennis, he won six Grand Slam singles titles and three Grand Slam men's doubles titles between 1985 and 1996. He also won the Masters Grand Prix and was a part of the Swedish Davis Cup-winning-team four times. In addition he won four Masters Series titles, four Championship Series titles and the unofficial Olympic tournament 1984, was ranked in the singles top 10 for ten successive years, 9 years in the top 5, and is considered one of the greatest players of his era. Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015.
Document 14: Piet Norval: Pieter ("Piet") Norval (born 7 April 1970) is a former tennis player from South Africa, who turned professional in 1988. The right-hander represented his native country in the doubles competition at the 1992 Summer Olympics in Barcelona, where he partnered Wayne Ferreira. The pair won the silver medal, after losing the final to Boris Becker and Michael Stich from Germany. Norval reached his highest singles ATP-ranking on 19 June 1989, when he became the no. 125 of the world.
Document 15: 2014 ABN AMRO World Tennis Tournament – Doubles: Robert Lindstedt and Nenad Zimonjić were the defending champions but decided not to participate together. Lindstedt played alongside Łukasz Kubot, but lost in the first round to Julien Benneteau and Édouard Roger-Vasselin. Zimonjić teamed up with Daniel Nestor, but lost in the quarterfinals to Michaël Llodra and Nicolas Mahut.
ground_truth: Pieter ("Piet") Norval