I can’t even blame young women in that age group too much - at first it sounds like a nice arrangement, being a SAHM and housekeeper, not having to deal with the complexities and bullshit of being in the workforce. But this comes with a barrage of issues:

• You don’t get any experience at a time where others are getting tertiary education or are already in the workforce getting experience. The longer you wait with these things, the harder it gets to actually get a job if you need one
• You are at the economic mercy of your significant other, and this fact alone enables abuse. If your partner knows that they have full control over your finances, they might be tempted to use that power, because you can’t do shit. They also have the ability to prevent you from leaving, at least on your terms, and you might not even be able to lawyer up in case of a divorce.
• The economic situation also means that if you are able to escape an abusive relationship, you might not have the financial means of providing for your children - which might cause them to live with the person you fled from, another reason why escaping when things turn sour is a daunting task
• You don’t work towards your pension, ensuring that you will spend your old age at the absolute minimum the state provides.
• Having children takes a harsh toll on your body even when being 18 - 21 where your body is in a great shape. Having many comes with a bunch of issues you might not even realize you signed up for.
• All of these things are also an issue when your partner is caring. They might die, or even worse, become disabled, leaving you with no ability to provide resources needed for medical care. They also might decide they want a divorce, leaving you with no income besides child support and whatever basic security your state provides.

These things should be taught at school, pretty early on, and repeated during the course of primary/secondary education at the respective levels of understanding for the age. And they should be taught regardless of gender, because the lesson of “giving up your autonomy is a very bad thing (outside of tightly defined situations in the bedroom if it’s your thing)” is one that all kids can profit from. Sadly, with the dismantling of education and pushback on gender right (it’s not just womens - these strict gender norms are hurting everyone regardless of gender - but they and the trans community bear the brunt of the assault) i can’t see the US actually trying to prevent slipping back over 100 years regarding these things, and this bullshit is also coming over the pond like an giant oil spill.