Airsoft guns are toys and can be purchased by anyone especially since Wal-Mart sells them. However, higher end guns are usually sold to persons that are at least 18 years of age. On this note, there are lots of minors that have higher end guns because the internet is quite a vast marketplace and those that are mature are usually part of the community but do not engage in events.
If your customers are from Montreal tell them to come visit me I am a local store and I can definitely help integrate them into the sport locally as I do pretty often. You can refer my website for details: www.SurplusIG.com