Zerodha Co-founder Nikhil Kamath, youngest Indian to sign 'The Giving Pledge', said Infosys' Nandan Nilekani, Biocon's Kiran Mazumdar-Shaw and Wipro's Azim Premji inspired him to donate wealth. "All four of us are friends," Kamath said. "We never speak about [morality's importance] but it hits you very hard early in life when you hang around with people aged 70-75," he added.