I taught myself to ride a bike at age 5 1/2, inspired by reading
Curious George Rides A Bike. I figured if he could do it, I could learn. I went to the house of a girl I knew and borrowed her bike (no training wheels) and practiced in her driveway for a couple of hours till I knew how to start, stop and steer. I picked a girls bike because I figured it would be easier than dealing with the top tube of a boys bike.
Then for my 6th birthday, my Dad got me this. It was way too large;
and I had to learn all over again. Start by standing on a stool and stop by crashing; and that kind of thing.