I was 16 when I had a kiss that was consented, it's the only one I consider to be my first from then. The rest were forced but I was 16 with a 20 year old. Sadly we were forced to break up, may have been a good thing.
I honestly don't remember how old I was when I got my first kiss. I know I was in middle school, but can't remember if I was 12 or 13. It was somewhere around there though.
Then I got to high-school and got my first real-good kiss!
I got a kiss on the lips when I was in first grade (6ish?) by a cute same-aged boy on the bus that told me to "close my eyes" haha. And I kissed a cute boy in 5th grade at the end of the year party (10ish). But a real boyfriend/girlfriend kiss, after those, was when I was in 9th grade (15ish).