instruction: From the passage provided, how old was Betty White when she died?
context: Betty Marion White (January 17, 1922 – December 31, 2021) was an American actress and comedian. A pioneer of early television with a career spanning almost seven decades, she was noted for her vast body of work in entertainment and for being one of the first women to work both in front of and behind the camera. She produced and starred in the sitcom Life with Elizabeth (1953–1955), making her the first woman to produce a sitcom.
response: Betty White was 99 years old when she died on December 31, 2021.