The Short Cut

I'm curious to know if a study has been made regarding the average age that a woman decides to cut her hair short. A man-cut being a short haircut. It just seems that older women in general seem to have short hair. Why is that? Is it a time-saving thing? Is it tied to menopause?

If you've heard of such a study (there has to be one underway somewhere!) then please comment on this post.

Thanks!