Warren Buffett, 94, donated a record $6 billion worth of Berkshire Hathaway stock to five foundations on Monday, his largest annual donation since he started his philanthropic journey in 2006. Related: Warren Buffett Says to Forget About 10,000 Hours of Practice — If You Want to Master Something, Do This InsteadThe donations were delivered on Monday. Warren Buffett. After Monday's donation, Buffett still owns about $145 billion worth of Berkshire shares, which comprise the vast majority of his net worth. Susie Buffett is 71, Howard Buffett is 70, and Peter Buffett is 67.