I learned at six, or something like that. No training wheels. No instruction. I had older siblings, and there were bikes around. I didn't use the pedals at first. I would coast down the street, and then get off and walk the bike back up the hill. I can still remember the moment when I realized that I could also pedal. I started pedalling as I road down the hill on the sidewalk and then I pulled out into the street and road back up to my house. I had acheived new freedom and power.