You might live to be 100 years old. But will you be able to afford it?

William Ubbens, 93, is already almost a quarter century into his retirement, and is hoping for plenty more years ahead, with his pockets full. At the start of the new millennium, Ubbens and his wife decided to start a new phase of their life. "My wife said, 'That's it. I want you to sell the busines...