Update:
Please note the following clarification to Chapter 6 / The Food and Alcohol Sector, bottom of page 110. As per the passages in blue, below, the section should read as follows (and will be revised when the book is reprinted):
Age of Majority
The age of majority, or drinking age, is either 18 or 19 years of age and varies by province and territory. Licensees are obliged to check identification of any patrons who appear to be under the age of majority. Licensees may not serve liquor to minors, however people under the age of 19 may consumer alcohol supplied to them by their parent or legal guardian in their home, and in the presence of the parent or legal guardian. Minors are nor permitted into premises that provide adult entertainment.
Licensees may employ minors to serve alcohol only if they are serving it as part of a meal. They may not, however, dispense alcohol separately (but 18-year-olds may be licensed to do so in Ontario, for example). Minors who provide entertainment in age-restricted licenses premises must be accompanied by their parent, guardian, spouse, or common law partner. Table 6.4 outlines prohibitions against the sale and supply of liquor to minors.