I was thinking of mentioning that.
More than killing the sport, because some people don't care about that. If you're playing in public view without proper permission and procedures followed etc, and someone tells the police, you'll find an armed response unit pointing very real guns at you very quick. It can be scary, and if you make a wrong move, you'll find yourself with some holes in you.
I don't want to sound over dramatic, but if nowhere near you has an airsoft site that allows people of your age to play, then either travel, or don't play, otherwise you could well be risking your life, the lives of others and your own future potential (firearms conviction at 14? say goodbye to decent job prospects). Airsoft is brilliant, it's a huge part of my life and very little comes between me and my 'softing, but it certainly isn't worth my life, and if an armed response wanted to come between me and airsoft, well, I'm gonna do what the person pointing the business end of a G36 at me says.
Also, just because you're a kid won't stop them putting a bullet in you (confirmed by a senior counter terror manager and the top private security consultant in the country approx ten minutes ago), so don't think being a minor would excuse you.
Don't want to put you off, but for your own safety, you've got to know it. In all honestly, you'll probably find somewhere to cater to you anyways.