It's nothing personal dude, but once someone declares themselves underage (or as you say, your brother did), then you're pretty much screwed unless you can prove otherwise. We do accept underage members what abide by the rules (there are many, and they do).
But this situation reeks of an underage kid having circumvented the AV policy as well as broken the law. Airsoft is not on very safe legal grounds in Canada, and the community makes every effort to try to maintain the positive we currently have of responsible, law-abiding ADULT airsoft players. So I hope you understand our position on this.
And here's to hoping that you do make it to the noob day. It's the perfect way to get initiated into the sport as well as getting age verified.