Upvote:5
Here's what you need, according to the European Commission's website for travel to Germany
In addition to their own valid travel document (passport or ID card), although not obligatory by law, all minors entering or leaving Germany are advised to carry an authorisation (where possible in the languages of both the home country and the destination country) signed by their parents/legal guardian. The document should show:
- that the minor has their permission to travel alone
- the contact details of the parents/legal guardian
Note it says it's not obligatory, so the officer may not even ask you, but I'd say it's still a very good idea to have it on you.