The IDPA web site should list clubs and gun ranges in your area that have matches. If there are none listed, start calling your local gun shops/ranges and see if they know of any. The local matches are just that, local. They go by the rules, but you just compete against yourself, not at a state level, until you got to a state match. I've not seen kids that young competing at any of my local matches, but as long as they know the rules, are safe, and have good gun handling skils, I dont know why they couldnt compete.