Was Ann Margret in Blue Hawaii and how old was she in that movie?

Yes, Ann-Margret starred in the 1961 film "Blue Hawaii," where she played the character Susan. Born on April 28, 1941, she was 20 years old at the time of the film's release. The movie is notable for featuring Elvis Presley in the lead role, and it helped boost Ann-Margret's career in Hollywood.