Oscar-winning actor Bing Crosby’s widow and steward of his legacy, Kathryn, has died at age 90. A family spokesperson confirmed in a statement that Kathryn died Friday night at her home in Hillsborough, California, surrounded by loved ones. Kathryn, billed as Kathryn Grant in films, was 23 when she married Crosby in a Las Vegas ceremony Oct. 24, 1957, and became his second wife. Crosby was 54 and an established entertainer. In the 2003 book, Bing Crosby: Crooner of the Century , Kathryn shared that she was glad that she married an “older man.” According to her, Crosby had “already formed” his sense of character when they met. “In other words, I knew what I was getting. With a younger man, you can’t…..