I didn't learn how to ride a bike until sometime in fourth or fifth grade, so probably when I was nine or ten years old. The funny thing is I didn't even have a bike of my own, I actually managed to get my friend's dad to teach me and then eventually my dad got me a bike after I told him I had learned how to ride. I was a little scared at first, but it actually ended up being a lot easier than I expected and I managed to pick it up pretty fast.
I biked almost every day for several years after that, biking to school often. However, I currently don't have a bike and haven't in several years, but I intend to get one soon so I can start riding again. I miss it.