I feel sorry for whomever's parents reported 21 years as the minimum age to bicycle alone!
Researchers at the University of Colorado in Denver surveyed 954 households with children aged from one to 14 to find out at what age parents thought children could safely engage in unsupervised, potentially risky activities.
Parents reported a wide range of acceptable ages for unsupervised activity -- from six to 21 years to cycle alone.
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I rode 140 miles alone when I was 15. It was from Aspen, Colorado to near Colorado Springs, CO. There are long distances between towns. I have to see how I feel about it if my kids decide they want to do something when they could older.