On-premise consumption is subject to provincial regulation.
In general, the minimum drinking age is 16 however:

in one province the minimum drinking age is 16 for spirits and 15 for wine and beer.

Some provinces prohibit consumption of spirits for those under 18.

The legal drinking age with the entire United Kingdom (England, Scotland, Wales and Northern Ireland) for the purchase of alcohol is 18 years old.
The actual laws regarding the legal drinking age in the UK are complex and are detailed below:
Persons aged 5 - 18 may consume alcohol at home, it is only illegal for persons […]

Both the minimum legal drinking age and the minimum purchase age in Germany are 16 for beer and wine, and 18 for spirits. Beer and wine may be served to under 16’s only if accompanied by parent or guardian.

The minimum age to buy beer and wine in the Netherlands is 16, and 18 to to buy spirits and hard liquor. Supermarkets are not allowed to sell liquor and only sell beer, wine and alcoholic beverages with an alcohol percentage of less than 14 percent.
Minors under the age of 16 may not buy alcohol, […]

New Zealand Sale of Liquor Act
New Zealand has no minimum legal drinking age, rather we have a minimum legal purchase age - it is important to make this distinction.
The minimum legal purchase age in New Zealand is 18 years. If young people wish to purchase alcohol or get into licensed premises they need to provide […]

There are no current drinking age laws in Vietnam.

The minimum age for purchasing Alcohol in Thailand was 18 until 2006 and was not often enforced.
Following the military coup in 2006 the new regime suggested a new age of 25 but following significant resistance from both the public and the drinks industry a new minimum purchase age of 20 has been declared and is […]

There are currently no drinking age restrictions in Soviet Georgia.

There are no drinking age restrictions in Portugal.

There are no drinking age laws in Nigeria.