"I can't buy time, I can't buy love...": Berkshire Hathaway billionaire Warren Buffett has a lot to be happy about. He is currently the fourth richest person in the world, with a net worth of $90.1 billion. But Buffett says his financial success isn't the root of his happiness — it's that he enjoys his work and his loved ones. "I can't buy time, I can't buy love but I can do anything else with money, pretty much. And why do I get up every day and jump out of bed and I'm excited at 88?