Former US first lady Barbara Bush died Tuesday at the age of 92, her husband’s office said. “A former First Lady of the United States of America and relentless proponent of family literacy, Barbara Pierce Bush passed away Tuesday, April 17, 2018 at the age of 92,” said a statement from the office of her now widower George H.W. Bush. They were married for 73 years. Barbara Bush has long been considered the rock at the center of one of America’s most prominent political families, as the wife of a…