On this website your free to access tonnes of content and read reviews and learn and explore airsoft and this community regardless of your age. Once your old enough you can then become Age verified and access other parts which are limited to buying and selling and acquisition.
In your local community your rules will be set by the field owners and their insurance providers, it is not that people do not want to enjoy the sport with younger people (although some do not, which is also fine) it is usually that their insurance provider will not cover liability for minors.
Check out the games in and around your area and contact the people running them. Let them know your exact age and if your parent or legal guardian can accompany you.