I'm pretty sure I was 6. My older brother, and his friend took my training wheels off. I remember being mad at them because I couldn't ride without them. I decided just to learn. I think it took me two nights to fully get a hang of balancing. When I rode on two wheels under my own power for the first time, I ran into the house and exclaimed I had conquered the bike! Well maybe not those exact words. I remember nobody payed attention to me.
Oh well, I have loved riding ever since.