New Delhi: Indian corporate leaders such as Basant Kumar Birla, Keshub Mahindra, C P Krishnan Nair and Kushal Pal Singh have been listed among the world's top 50 septuagenarian business heads compiled by U.S. magazine Business Week.

Among Indians, 87 year old Basant Kumar Birla is the Chairman of Birla Group and Keshub is the Chairman of Mahindra and Mahindra at the age of 84. While 84-year-old C P Krishnan Nair is the Chairman of Hotel Leela Venture, 77-year old Kushal Pal Singh is the Chairman of DLF group.

Apart from that, the list also includes legendary investor Warren Buffett, media mogul Rupert Murdoch, adult entertainment publisher Playboy's Editor-in-Chief Hugh Hefner, billionaire investor George Soros and former Federal Reserve Chairman Alan Greenspan.

The magazine noted that B K Birla still maintains his nine to five office routine. Although many of the businesses are run by younger generation, the octogenarian is still very much in control of several companies, which he runs from his hometown of Kolkata.

"Wharton graduate Keshub Mahindra has opted out of day-to-day management of the conglomerate long ago and has appointed nephew Anand Mahindra as Managing Director. However, Anand refers his Chairman as the hidden weapon and a competitive advantage for the group, and as a philanthropist, Mahindra is on the boards of many leading Indian companies, including HDFC, India's largest mortgage lender," says Business Week.

"A self-made businessman, Nair is at ease hobnobbing with the Indian powers as he is with world figures like the Dalai Lama, who often stays at the Leela in Mumbai. Nair oversees his business," commended the magazine about C P Krishnan Nair.

The report mentioned DLF Chairman K P Singh as a 'czar of Indian real estate' and said he has transformed a New Delhi suburb into a call-center hub nearly two decades ago.