Interesting thoughts, As the Father of two two handers it seems to start at about Age 6.
They can't strike with a 6 pound ball, so they sneak one of your balls off the rack or they grab a 12 or 13 pounder off the rack. All of a sudden the sam hits strike or don't bounce off the pins leaving a split.
Then I buy them a 10 pound ball, teach them the skip step and away they go! One a 239 average one summer and the sweetest power swing ever. The other beating me 2 out of 3 when picking up the ball.
Whey more girls are not doing it yet I don't know.
As Mo Pinel I understood said, "some day they'll say why's that old guy bowling with only one hand?"
Everyday I see more and more of them. Many of them not very good, but eventually. The young girls I don't know why there arent many of them gravitating to it yet! Good to hear that some are.
Sincerely,
Luckylefty