The billionaire investor used his annual letter to say why babies being born in the US are the luckiest ever and how he expects to live to 100 Warren Buffett has used his annual letter to Berkshire Hathaway shareholders to lambast presidential candidates who talk down the nation's economic future as "dead wrong" - an apparent jab at Republicans and frontrunner Donald Trump. Related: Givers that keep on giving: the world's top philanthropists