What does lord Tennyson means when he says a nurse of ninety years in his poem?

In his poem "The Lady of Shalott", Alfred, Lord Tennyson, refers to an "old nurse of ninety years". This line is part of a description of the Lady of Shalott's surroundings and her isolation from the outside world. The old nurse is a symbol of the Lady's confinement and her limited experience of life beyond her tower. She is a reminder of the Lady's mortality and the inevitable passage of time. The old nurse also represents the Lady's connection to the past and the traditions of her family. She is a source of wisdom and guidance for the Lady, but she also embodies the restrictions and expectations that society places on women. The line "a nurse of ninety years" suggests that the Lady of Shalott has been living a sheltered life for a long time, and that she is渴望freedom and independence.