3 and a half
In order to operate a boat in Oregon, you must carry on board your certificate of number.
16
I am pretty sure that you need a licence to operate a boat. So unless they have a boat licence the answer is no.
13
16
21
Only with an adult holding a valid boater education card
At least 16, to operate a boat you need a valid drivers license.
200 feet
This depends on state or national law. In many places, if you have a valid driver's license you can operate a boat, and generally a boating safety course is so you can operate a boat without a license. In other places, both may be required in order to operate a boat.
16 year old with a boaters education card.
In Oregon, to operate a boat legally, you must carry a valid Boater Education Card if you were born on or after January 1, 1989. This card demonstrates that you have completed a state-approved boating safety course. Additionally, you should have any required registration documentation for the boat itself. Always check for any specific rules or regulations that may apply to your type of vessel.