How Old Are the Men In HR?

Last week I wrote post entitled Are Men In HR Going the Way of the Dinosaur. I ask the question, based upon some research, whether men are a dying breed in HR. Evidence certainly points to that. Statistics from the Bureau of Labor Statistics show that, depending on what study you read, women hold anywhere from 65% of management jobs to 70%+ of all HR jobs today. The data is not clear on how many of the CHRO jobs are female, but these numbers show that most in the future will be held by women.

A corollary to this is the wages earned by men versus women in the field of HR. Over at Kim's HR Potpourri she lists The 10 Worst Management Jobs for Women, on this list is "Human Resources Manager: Women earn an average annual salary of $57,744, which is 69% of what male peers earn."
One of the interesting things about statistics is you can all kinds of different numbers. This is supposedly a BLS number, yet the studies I looked at show much higher numbers. These figures show women in HR management postions making 79.3% of male counterparts and in specialist postions making 73.4%. Still not on par, but as was shown in 77 Cents and Gender Discrimination: The Wrong Conclusion, written by Stephanie Thomas, there are multiple reasons.

One reason I believe, at least in the field of Human Resources, is age. Given the declining number of men you find it the field, I bet we would also find an increasing average age for men in human resources. And with age generally you see a higher wage. So as the average age of men goes up and the average age of women in the profession goes down statistics will show a wage gap. This may eventually go away as men go away from the field, or at least get reduced in the percent in the field.

I have no numbers to back this up. This is my impression and best guess from what data I have looked at. What do you think? Or better yet what do you know? Anyone have figures on the average age of men in HR versus the average age of women in HR?