I was 8 1/2 and that would have been 1993. I knew about it before it happened. Funnily enough, mine started at a pizza place. While in the car on the way home I announced it. My dad said, "What'd you do, rub pizza sauce in your underwear?"
It was embarrassing being in elementary school. There weren't any garbage cans in the bathrooms, so of course girls always asked me what I was doing. For the most part they didn't tease me.
What was more embarrassing was when I needed to change my pad, and so I asked to be excused to the restroom, and a teacher wouldn't want to let me go. I whisper to them the reason why, and they don't believe me. So there were times I came home with bloody underwear/clothes and my parents complained and my teachers would get in trouble for not letting me leave. (Not like I took advantage of it.)
I remember one time at a sleepover I was having a period, and when the girls found out, they were ewww at first, then several of them requested to see a bloody pad before I threw it away. Of course I was like O_0, but I acquiesced. They looked at it only thankfully.