New Delhi, May 16 -- Warren Buffett, the towering figure of American finance who built Berkshire Hathaway from a struggling textile maker into a corporate behemoth, has revealed that his decision to step down as chief executive came after finally feeling the effects of his advanced age. In an interview with the Wall Street Journal published on Wednesday, the 94-year-old billionaire investor said he began experiencing the limitations of ageing only in recent years, despite remaining sharp-minded well into his ninth decade. "I didn't really start getting old, for some strange reason, until I was about 90," Buffett told the Journal. "But when you start getting old, it does become - it's irreversible." The announcement of his December departure...