Similar age, must have been around 11 or 12. Had no idea about sex of any kind, but managed to kiss the girl across the street and found that I liked that very much.
About that time, during a sleepover at one of my buddies houses, he started playing with my cock. I had no clue what was going on or what to do. It kind of became a game of "I dare you". He started by putting me in his mouth then dared me to do the same with him. I felt those familiar stirrings, but had never cum before, had no idea what it was. I remember telling him to quit because I felt like I was going to pee in his mouth, little did I know. We carried on for months, and if he hadn't moved away, who knows where my sexuality may have ended up, but after he left, girls became my #1 priority.