Merman was 59 and Yarnell was 31. However, Ethel was in fine voice and excellent physical shape. I recall that she really looked to be a woman in her 40's. Her performance was generally praised as being a definitive interpretation of the role. I was 19 at the time and thoroughly enjoyed the production. The '66 clip from The Ed Sullivan Show is a knockout. I've never heard "I've Got the Sun in the Morning" performed with such gusto and exuberance.