My girls are still too sheltered at that age. They aren't "out in the world" yet. They don't know the birds & bees yet. Also, their homeschool workload gets pretty serious around age 15 or 16. We're talking college classes, advanced AP classes, etc.
In our particular family (due to genetics, etc.) we are very high IQ, so my wife and I decided to have some decently high standards for our children's homeschool education.

In modern day America, the culture and country in which we live, it is EXPECTED for a person to complete high school. That is one thing that has changed from the Middle Ages.
I'm not saying they have to go to college (that is the next step many people take -- they want the girl to not just have a HS diploma, but a college degree as well "just in case")

But I think having a high school diploma isn't too much to ask. The young man can have some patience. She'll still have some fertility left at 18, come on now. (I'm being facetious here, but actually pregnancy under the age of 18 isn't even ideal from a biological standpoint. And for Trad Catholics, marriage = likely pregnancy).

As for honorable courtship at 14 or 16, that would totally distract a girl from what she needs to be learning, studying, and doing during her "finishing off" period before she comes of age. But the finishing off period is something I never thought about until a few years ago.

Try to consider the parents point of view. You have children. You are responsible for them. You want them to be happy. You love them. You want to teach them the important things you know about the world, so they don't have to learn things the hard way. HOW DO YOU DO THAT IF THEY COULD BE GONE AT 16?
Just for starters, MANY topics you can't introduce until you've cleared the prerequisite course, "Birds & Bees 101". And do you REALLY want to take a totally innocent girl and introduce things to them they REALLY don't need to think or worry about?
I'm not going to introduce deep adult topics too early just so they can grow up a few years early. That's not necessary at all.

I don't just throw my kids into the deep end of knowledge, or the world, and hope they swim. I allow them to be kids when they're kids. (except I do teach them to work and practice self-mortification -- doing what you don't want to do -- from an early age)
I insist they learn all the basics, including knowing how to cook, clean, etc. Both boys and girls. But I allow them time to play, have fun, and be kids. I'm preparing them for a REALISTIC future -- which, let's be honest, will be mostly work and certainly not all fun & games.

But no, I don't teach my daughters to have a GenZ-like attitude towards age. As homeschoolers, my kids aren't obsessed with limiting all socializing to a narrow age range plus 2 years and minus 2 years from their own age. That's not realistic at all. Just look at any office or workplace. Or convent, monastery, etc. Nowhere in the real world are you sectioned off with 30 or 50 people born in the same year as you. Public school is artificial as hell, designed to create mindless drones for corporate offices, and destructive in every way.

I'm all for preparing my children with the proper information at the proper age. But until they have to go study/work/etc. out there in the world, they don't need to know all the gritty details about men and how the world works.

Maybe the answer would be different for some public school girls whose innocence was taken away years earlier -- both in terms of knowledge and experience -- but neither of those things apply to my Trad, homeschooled daughters.

You said you only started thinking about this a few years ago. Is this because they were too young to seriously think about it or because the topic didn't occur to you?

. But I've learned a lot through raw experience, I'll tell you that much!

Ah but do you know what hasn't changed for thousands of years? Human nature.

Many trad girls are finding this out now. The hard way. All they needed was good, open minded fathers to tell them to drop their frivolous standards (not the good ones obviously), and accept that they are not going to get everything they want. The wanted their dads to take an interest. And now we have single women all over the resistance who, either are not going to get married at all or marry badly.

this is the trad equivalent of "Hoe phase to trad wife" thing we hear bandied around on social media. Trad equivalent in that the "hoes" herself out to worldly ideas, and then later, when its too late, decides she is "going to settle". Only to find that the only men interested in her are the weaker variety of men.

If their fathers had only explained to them that men are attracted to docile women, not prideful witches who think their "education" is a flex, then they might have had a happy life.

She’s aware of their presence in a way she wasn’t before. Before they were just another kid to play with.  Now she’s suddenly shy around them. Wants to be seen, but no longer in a rough and tumble type of way (at homeschool co-op the kids run around and play before and after class).
Today while getting ready for homeschool co-op instead of wearing a basic skirt and blouse, she chose a jumper with floral embellishments, and really put herself together quite lovely. Her sisters giggled and said that it’s because a certain boy might be there and the poor girls face turned all shades of red.
This area of child rearing is all new to us (my husband and I) hence the discussions of late. Obviously she is a long ways away from courtship.  I was not expecting to have to talk to my 9 year old about love, courtship,  marriage and all of that until much later. She has been asking questions about marrying and who to marry, etc. Our girls are all very innocent. Her curiosity is natural, not manufactured or helped along by media. We don’t have TV programming so I know they’re not watching weird shows that teach them how to be “boy crazy” and they don’t keep private audience with friends. All literature is closely inspected before they read so they are very sheltered.

I was raised much differently than we are raising our girls. My husband as well. Neither us were raised Catholic. We really want to do things right. Raise up good girls so that they will be deserving of good men and have the best shot at gaining heaven with their future spouses. Our girls already know that we hope they will stay with us until they marry or enter the convent. Our hope is that they find a suitable spouse and marry young.

Do you think the girls should drop their standards if it means race mixing? I think a lot of people don't realise that it's better for the white girls to marry a much older white man than a young non-white.