If the answer above is None it means there is no specific mention in the legislation, but you still need to ask local law enforcement before drinking in Denmark.
While there is no age requirement for drinking alcohol beverages in Denmark, there are laws that prohibit minors from buying alcohol from on-premise and off-premise outlets. If a shop or bar fails to ask for an ID card and is identified having sold alcohol to an underage, it is subject to fine. A national ID card, obtained in the local town hall, can serve as age verification.
You can find more legal details and links here:
Wikipedia Legal Drinking Page