 Over any major shift, he says he plans to cut off donations to the Bill and Melinda Gates Foundation after his death and allow his three children to decide how to distribute the rest of his $128 billion fortune. The 93-year-old Buffett has already given away about $55 billion worth of stock in his Berkshire Hathaway company to five foundations, with the biggest share going to the Gates Foundation. The other four foundations are affiliated with his family.