The sale of alcoholic drinks is prohibited to all person under 18 years and who are noticeably drunk or apparent mental disorder. According to 'Artigos do Decreto-Lei nº 106/2015 de 16 de Junho, em vigor desde 01/07/2015'. More info here.

Remember that alcohol should be drank with moderation. Wine is an essential part of European life and culture. The importance of moderation in alcohol consumption is crucial - in small quantities is good for our body, in excessive amounts can be harmful.