I'm currently married for only 4 or 5 years officially. But we've been committed for about 12 or 13.
I was in a similar situation. She started wearing a ring to keep men from hitting on her, and eventually decided she didn't like the implicit lie told by wearing it.
So we got married, to make an honest woman of her.
We were married by a judge who BEAMED the entire time. It was slightly unsettling. What did she know that we didn't? But I decided it must have been a nice break from idiotic petty criminals.
A few years ago we encountered a larval human, too. But I prefer the term "Baloney loaf." It says it all, so far as I'm concerned.
For making marriages work, I think the old cliche about "open and honest communication" is the best advice. Talking won't fix everything, but it often essential in figuring out what needs to be changed, and when.
Indeed, part of that communication should be appreciation ... or information about how more appreciation would be appreciated.
On mature, stable relationships and child-rearing:
Yeah, big time. IIRC for most of history, over most of the world, the parents - while *perhaps* the primary caregivers - generally had plenty of help for relatives and/or their community. It was shared. And a lot of it fell to older folks who maybe weren't as quick to smack around mastodons anymore, but had other things to offer. I think that's because a lot of 20 or even 30 year-olds are best considered more "callow youth" than "mature". The "stable" could still be there, though, which helps.
I'm not saying that you young'ns shouldn't marry and have kids, btw. I'm saying you suck.
No wait, sorry. Just slipped out. How about "You should be
conscious of how you treat your kid. And if you read one book about it, read at least 2 more."
I've found military leadership principles surprisingly applicable. Some of the less draconian ones, at least.
Ooh. Get a dog first. A rather large, friendly one. With a loud bark. Surprisingly good practice, IMO.