As far as women are concerned, this is total bullshit - many women were so uptight when they got married it took them forever to loosen up and admit they had sexual desires. That isn't the case in this day and age.
More women are more loose now and admit their sexual desires?
Women outlive men in almost every country. That doesn't necessarily mean it's a good idea for an older women to date a younger man but just statistics.
Something to consider when planning that next or first trip to the alter if you have a keeper. At the end of the day, a keeper is a keeper regardless of age gap and as long as you're both of legal age.