Well I was an early bloomer when it came to noticing I liked girls. I mean, I was the boy on the playground who chased girls around, or when I got smart, played their games - screw the guys, if I could play house I was hanging with the chicks.
In any case, I saw female genitalia early on. I can recall being bathed with my younger sister but I do recall the first time I saw pubic hair. I walked in on my mom after she got out of the shower. Whoops.
As for girls my own age, I was playing I’ll show me yours if you show me mine when I was still in elementary school, but that didn’t really count because it was always in a dark place on the playground or at night at a sleep over. No real well lit peeks.