If you operate a motorized boat powered by an engine of 10hp or greater, or a sailboat that is 16 feet in length or longer and you’re between the ages of 12-15, the state of Oklahoma requires you to obtain and carry an Oklahoma Boating License on the boat at all times during boat operation. Once obtained, your BOATsmart! Card is good for life and will keep you legal when boating in 40 different states.