Glynis Johns, the British actress known for her role as feminist icon Mrs. Banks in 1964's "Mary Poppins," has died. She was 100.

Johns' longtime manager Mitch Clem told CNN on Thursday that she died "peacefully" Thursday morning in Los Angeles at an assisted living home, where she's lived for the past several years. She is survived by her grandson Thomas and her three great-grandchildren, Clem said.

A cause of death has not yet been determined.

"Glynis powered her way through life with intelligence, wit, and a love for performance, affecting millions of lives," Clem said in a statement on Thursday. "She entered my life early in my career and set a very high bar on how to navigate this industry with grace, class, and truth."

Johns' career as a film, TV and stage actor spans nearly nine decades.

As a teenager, Johns scored her first film role in the 1938 romantic drama "South Riding." She went on to appear in a number of movies throughout the 1940s, including the war-era drama "49th Parallel" in 1941, for which she earned a best acting award from the National Board of Review.

Born in South Africa and raised in the United Kingdom, Johns starred in a number of Hollywood films and TV shows throughout the 1950s until her big break in 1960, when she starred alongside Deborah Kerr and Robert Mitchum in the family-driven drama "The Sundowners" as Mrs. Firth. The film earned five Oscar nominations, including one for Johns in the best supporting actress category.