This is going to be a hard issue for us, since my mother lost her mind and broke all her rules when it came time for me to date. The rule had always been no dating until 16. In my family, if my parents said it, they meant it, so we didn't bug the crap out of them to change their minds. We just knew that if it was a rule, we might as well shut up and accept it. I had several older siblings and all had lived under the no dates until 16 rule. It was law. I never thought to question it.
The summer I was 13, a boy developed a mad crush on me. I lived in the sticks , but at 16 he had 2 cars and a motorcycle and he could just drive on over. And he did. All the time. To be fair, I looked nothing like a 13 year old. Let's just say puberty hit way early and with a vengeance.

I was bright, could have skipped grades, was raised as a much younger sibling around older people, etc. In other words, I didn't really act my age either, so people never took me for 13.
Anyway, said boy just kept showing up to visit. Having lived in the sticks all her life, my mother was used to seclusion and privacy and him just hanging around became a hindance to her running outside in her nightgown to bring in the laundry.

Why not just run him off, you ask? Because he was just too nice.....My parents adored him. They didn't want to hurt his feelings. He'd been asking me to go to the movies, out to eat, etc., and I'd always said, "I can't date until I'm 16. I'm not going to ask them because I already know the answer. It will just irritate them if I ask."
One day, my mother had enough. She was exasperated and without thinking, said, "Can't you and that boy just leave and go somewhere? Like a movie or something?"

I thought I had heard wrong so I asked her to repeat it and she did. I said, "But that would be.......like a date!" She muttered something and said for us to just go.
I walked outside, looking like I'd just been whacked upside the head and told him the news. And off we went to the movies. Once Pandora's box was opened, she really couldn't close it. Even then, I wondered what in the world she was thinking. My siblings were stunned....and miffed.
As for boys taking advantage, I had the best birth control in the county. I soon found out my father's reputation preceded him and it seems every boy within a 50 mile radius was warned by his father or grandfather to never mess with me.

I don't know exactly what they were told, but it worked.
My curfew was probably 9:00 on a school night until 16, then I probably got a bump to 10:00......but we're insomniacs, so no one would be in bed by 10:00. One weekends, it was probably about the same for under 16, but once I turned 16, on weekends it slowly worked its way from 11:00-12:00. I do remember now that until about 16, my mother would give us 30 minutes to get home after the movie was over, so it wasn't a set time, but it was based on when the movie ended and we couldn't go to the late movie.
As for rides home from school, we lived in a small rural town and lots of kids got cars before they had a license. Freshman year. It was common for everyone to ride home with anyone from school anytime after 6th grade. But that's a small town where everyone knows everyone else and their parents. A whole different world.
With our DD, I will not lose my mind.

Her father started dating very late, so we will average our starting ages and go with that.

Seriously, the rules we set are ours. I got lucky because boys were scared crapless of my daddy. They will not be scared crapless of DH. Me maybe, but not DH.

And here, we don't all know everyone else. And if our kid does wrong, we're not going to get a phone call from a neighbor ratting her out like my parents did.
I think 9th grade is good for group activites and 16 for dating alone. We can live with that. So long as she has a tracking chip implanted.
