What is the minimium age for driving a boat unattended?

At this point in time, there is no federal law covering minimum ages for boaters, but many states have minimum ages and licensing requirements. See the link below for information on a state by state basis. Boating education courses are inexpensive, and very worthwhile if you are a boater. Most states are moving towards licensing, so even if your state has no requirements at the present time, if you take a boating safety course now, you will in all probability be grandfathered in if, and when, your state does adopt boating educational requirements. The US Power Squadron has a nationally recognized boating education program in most, if not all, states.