My parents were strict. I had "boyfriends" starting in maybe 7th grade. LOL, but they were the kind you only talk to at school, never on the phone, didn't even sit with him on the bus, & we never went anywhere. They never knew about them.
I had my first kiss summer of 9th/10th grade while away at a 2 wk summer music camp with a boy I met there. I was a late bloomer. And to my total embarrassment, we were voted the "most red hot couple" of camp.

Never saw him or spoke to him again after camp. LOL
Lots of crushes & make-out sessions (and more)

with one particular guy (but not dating) on band trip busses for next couple years. (hormone years)
Then spring of grade 11 (age 16.5), I started dating my first REAL boyfriend while on a band trip to VA/DC. He happened to be grade 8 (age 14 & few months). We dated for a full year. We were VERY serious. He was mature for his age, & I was immature for mine. (I tended to hang with younger people & still do.) We found ways to be alone (or nearly alone). Often lying to parents. We became the senior / freshman relationship later in the year when next grade started. We lost our virginity together (I just turned 17 & he almost 15). Talked of marriage after college for both of us. Ultimately what broke us up was too fast too quick -- and a pregnancy scare that his mother learned of. He needed time with friends & sports too.
Oddly enough, 22 yrs later, we run across each other on Classmates. Been emailing for 2 yrs now. - and he lives next town over from me. (We don't live near hometome either. Go figure. We ran into each other once at grocery store about 10 yrs ago. But haven't seen each other besides that.) Still feel he's very mature & had his head on his shoulders. All the plans he had in 8th grade for what college & what degree have come true. Doing very well in his career. He's still into his sports & a band. I on other hand, went to the college I had picked at the time. Graduated. Never followed that career choice. And have been changing careers around every 7-12 yrs, still trying to find myself.
So, I really don't think age makes a big deal. At ANY age. I believe its a maturity level thing.