[mcguyver]

From the Firearms Act:

Special Cases — Persons
Minors

8. (1) An individual who is less than eighteen years old and who is otherwise eligible to hold a licence is not eligible to hold a licence except as provided in this section.

Minors hunting as a way of life

(2) An individual who is less than eighteen years old and who hunts or traps as a way of life is eligible to hold a licence if the individual needs to hunt or trap in order to sustain himself or herself or his or her family.
Hunting, etc.

(3) An individual who is twelve years old or older but less than eighteen years old is eligible to hold a licence authorizing the individual to possess, in accordance with the conditions attached to the licence, a firearm for the purpose of target practice, hunting or instruction in the use of firearms or for the purpose of taking part in an organized competition.
No prohibited or restricted firearms

(4) An individual who is less than eighteen years old is not eligible to hold a licence authorizing the individual to possess prohibited firearms or restricted firearms or to acquire firearms or cross-bows.
Consent of parent or guardian

(5) An individual who is less than eighteen years old is eligible to hold a licence only if a parent or person who has custody of the individual has consented, in writing or in any other manner that is satisfactory to the chief firearms officer, to the issuance of the licence.




AUTHORIZED TRANSFERS AND LENDING
General Provisions
Definition of “transfer”

21. For the purposes of sections 22 to 32, "transfer" means sell, barter or give.

1995, c. 39, s. 23; 2003, c. 8, s. 17.

Authorization to transfer prohibited weapons, devices and ammunition

24. (1) Subject to section 26, a person may transfer a prohibited weapon, prohibited device or prohibited ammunition only to a business.

Conditions

(2) A person may transfer a prohibited weapon, prohibited device, ammunition or prohibited ammunition to a business only if
(a) the business holds a licence authorizing the business to acquire and possess prohibited weapons, prohibited devices, ammunition or prohibited ammunition, as the case may be;


From the CFC Fact Sheet for Airguns:

Such air guns are exempt from licensing, registration, and other requirements under the Firearms Act, and from penalties set out in the Criminal Code for possessing a firearm without a valid licence or registration certificate. However, they are considered to be firearms under the Criminal Code if they are used to commit a crime. Anyone who uses such an air gun to commit a crime faces the same penalties as someone who uses a regular firearm.

The simple possession, acquisition and use of these air guns for lawful purposes is regulated more by provincial and municipal laws and by-laws than by federal law. For example, some provinces may have set a minimum age for acquiring such an air gun. For more information, please contact your local or provincial authorities.



It's a little vague, but basically they defer determination to the provinces, but clearly forbid prohibited and restricted firearms from minors with no exceptions. They do have exceptions to the 18+ policy for PAL, but under prescribed conditions. Minors using airsoft guns is not one of them.