More detail. I think i'm right in saying that refs need to be 16+ to officiate OA. They must also have been reffing for at least a year with the 20 game expectationAny age is fine, though you'll generally need to have a full year of experience with at least 14-20 Open Age middles completed. Yes, it will open up more opportunities ... in my part of the country this would most likely be higher division games of your grassroots league or lower division games in the County League