The author and her husband have three kids. Courtesy of Melissa Noble Over the years, my husband and I have wondered when to let our kids have more freedom. I'm not sure how old they should be before they start having sleepovers or riding bikes alone. My perspective shifted after we moved in with my parents, and I'm ready to let go more. A few years ago, when our son was 8, one of his mates asked if he could go bike riding around the neighborhood with him. This particular kid is a strong mountain bike rider and has always been mature for his age, so his parents trusted his judgment when he was out riding alone. In some ways, our son is also mature. He can help take care of his two little sisters , order a meal himself, and ask an adult a question with confidence. But when it comes to understanding road rules and being aware of hazards like reversing cars, he's easily distracted.…