For me it isn't the age but the shape they keep themselves in. As we get older (both men and women) it gets harder to stay in shape and keep the weight off. I was once with a woman in Brazil - hottest woman in the club, afterwards she took pride in having me guess her age, she was 38! and I was floored. She was in fantastic shape and led a very healthy lifestyle with exercise and diet - plus she was just plain good at her job. There are plenty of women, young and old, that aren't good at their job mostly because they don't enjoy it or don't enjoy the frequency - these are the ones that should hang it up.