So the thing is, I'm 18 and I want to travel by myself to my home country. The problem is that my parents wouldn't be able to pick me up or show up at he airport when I'll come back. Do they require for them to check in at the border if I'm 18? I heard once that there could be a problem if you're not 21, but I don't know if that's the correct information. Can anyone clarify and explain that to me?