bJ THE TIME she starred in ‘Downton Abbey’, the television series in which she played the cutting, waspish Dowager Countess of Grantham. Maggie Smith was 75 years old and had won two Oscars and Golden Globes, six BAFTAs, an Emmy, a Tony and dozens of other awards. And yet she told an interviewer, “I had lived a completely normal life… No one knew who I was.”