According to this NYTimes article:

Men, as might be expected, get slower as they age. At a recent five-kilometer race in Pine Beach, N.J., which drew nearly 1,000 runners, the fastest man was 24 years old and the men’s times increased with each five-year age group.

But the women were different — their times were all over the place with older women beating younger women in almost every age category.”

But with average runners, he said, older women may be faster because, oddly enough, they are trying harder than younger women and discovering for the first time what they are capable of.

Most middle-aged women grew up when track and cross-country teams were for men only. Some of those women, who had no opportunity to race when they were young, are just learning to be athletes and are running faster than younger women who may not care as much.

He described the experience for women as “a kind of wakening, an epiphany.”

Sounds good to me! 

Watch out, Girls!  We older women are just waking up!! Who knows how fast we will get!!

Happy Running!