Lucille Ball started her career at MGM there learning the workings of physical comedy. She was 40 years old by the time her hit TV series I Love Lucy made it to the air. She had three hit shows in a row. Carol Burnett first came to the attention of the public with her song about John Foster Dulles. Her training ground was The Garry Moore Show which after seven years led to _"The Carol Burnett Show" (1967)_. Betty White began her career in television in the 1940s and had her own sitcom Life with Elizabeth and had a wide ranging career from game show host to sitcom star.