My oldest brother would do long-distance biking. He biked from the UP of Michigan to Colorado and back on his first long-distance trip, then from the UP to Texas and back, to Maine and back, and to Alaska and back. He was serious about biking. He had a bike that he could balance on one finger, and which cost a few thousand dollars. On his first trip, to Colorado, he asked his kids if any of them wanted to go for a bike ride with him, without saying where he intended to go. Only his youngest son wanted to go. He was teaching at the time, so he had the summer off. He said he had planned on only a morning ride but decided to keep going. When his other kids complained that he had only taken Mike with him, he said, "I asked if anyone wanted to go for a ride."
Have you consulted a doctor about this? To suddenly forget how to ride a bike is frightening to me. It's one thing to get on it and be all over the place because our skills have deteriorated with age, but to forget to know what to do. Well, that's something entirely different. Keep track of other incidents that may come up.
This is an interesting article: The Wacky Neuroscience of Forgetting How to Ride a Bicycle The video is on-topic with the OP, pretty much, and I think you'll find it interesting.
It's crazy cool what we can do when our bodies are strong and healthy. Awesome! As far as the other kids, oh well, he did ask. @Ken Anderson
I decided that riding my Trike was more pleasant if I avoided running over my foot. Harold I. Pollner