Hi
I AM a 20-something female pursuing the shooting sports on my own.
My club has a slew of female juniors and the Second Amendment Sisters chapter attracts a good crowd every month, but outside of those events the ladies are definitely in the minority. And most of the ladies that do shoot are not in the age bracket you mentioned.
That said, I've been involved in a number of women's events in the last few years and never had a problem filling them up. There's always a waiting list.
There are tons of ladies out there who want to TRY shooting. Getting them licensed, with their own guns, and shooting on a regular basis is where the breakdown is from my perspective.
Or maybe they're all out there with their LTC's, paying GOAL dues, writing their Reps, and just are flying under my radar. I do chalk a lot of it up to the age demographic rather than the gender issue. 20&30-somethings of either gender aren't the backbone of any of my teams, the club, or other gun organizations & activities.