Sibanye-Stillwater has scrapped its mandatory retirement age for non-executive directors, signalling a decisive shift from age-based exits to performance-based tenure. The South Africa and USA-listed mining company’s governance change places board effectiveness above numerical age limits.
The immediate beneficiary of the Sibanye-Stillwater mandatory retirement age removal is Dr Vincent Maphai, the board’s Independent Non-Executive Chairman.
Born in 1952, Dr Maphai turns 74 in 2026. Some South African media have reported that he turns 73 this year, but the company’s annual filings indicate otherwise.
The previous retirement threshold stood at 72. Since 2024, the board had extended his tenure through special resolutions at Annual General Meetings. By scrapping the rule entirely, Sibanye-Stillwater formalises what had effectively been a temporary extension.
Dr Maphai holds a BA (Hons), BPhil, MPhil and PhD. He also completed the Advanced Management Programme at Harvard University.
His career spans senior executive and board roles at SAB Limited, BHP Billiton, Discovery Holdings, Stadio, Tongaat Hulett, Rand Mutual Assurance and the SABC. In addition, he chaired the University of KwaZulu-Natal and served on President Nelson Mandela’s Presidential Review Commission. This depth of institutional knowledge explains why the board has opted for continuity.
Sibanye-Stillwater does not stand alone. Across South Africa’s listed companies, directors and executives aged 70 and above remain common. Many bring decades of corporate memory that companies struggle to replace.
Seasoned leadership also comes at a cost. In 2025, the top eight executives at Standard Bank earned a combined R511 million. When shareholders pay such premiums, they often favour continuity over forced retirement.
Truworths provides a similar example. Michael Mark’s tenure has spanned more than 35 years. Although he signalled retirement in 2014 and again in 2022, he ultimately remained in his position.
Other companies with senior leaders over 70 include Caxton, HCI, Sabvest and CMH. With Sibanye-Stillwater removing its mandatory retirement age, the Annual General Meeting now becomes the ultimate arbiter of a director’s tenure.
If shareholders believe a director, regardless of age, no longer adds value or blocks renewal, they must use their vote to prevent re-election.
The burden of proof now falls squarely on the board and its nominating committees. They must justify why experienced directors continue to represent the best choice for the company.
