In the Harvard Business Review, there is the following report which is quoted here:
"The proportion of male-female partnerships in which the woman is at least five years older than the man increased sharply in the UK and US in the 1980s and 1990s.
Having remained at 3% for decades, it rose 8.3% in 2000 and is likely to be much higher now.
Today's wider career choices give women the opportunity to increase their desirability through financial success, an option that once was limited to males, the researchers say."
Another age boost for women?