Age verified means that you're 18 or older, and you've met with a site representative (showing photo ID and typically having a short interview) to have your age confirmed. Being 18 or older is the requirement for full participation in the airsoft community, this has less to do with maturity and more to do with being legally responsible for yourself (ie, if you do something illegal, it's your
fault, not your parents or anybody else).
Read these, and come back.
How to Get Verified!
Age Verification FAQ's - updated 2014 version
Airsoft and Canadian Law - Important Readme for New Folks