> But none of the things you mentioned are different between men and women.
That's exactly the point: none of the serious risk factors are strongly correlated with gender. (And you're forgetting the argument that young men are slightly more likely to be able to find another competitive job than young women because people like you are more willing to hire them, therefore men are at slightly higher risk of leaving.)
If you want to construct an argument in the service of the conclusion "I don't want to hire young women" you certainly can, but please admit that's what you're doing.
That's exactly the point: none of the serious risk factors are strongly correlated with gender. (And you're forgetting the argument that young men are slightly more likely to be able to find another competitive job than young women because people like you are more willing to hire them, therefore men are at slightly higher risk of leaving.)
If you want to construct an argument in the service of the conclusion "I don't want to hire young women" you certainly can, but please admit that's what you're doing.