Aged 15, I with both my parents full permission, they paid the tickets, travelled alone by plane from Glasgow to Copenhagen to stay with a family for three months and help out as nursemaid to their four little boys.
At 16, I went to finishing school in Copenhagen, for a full academic year, my parents were still living outside Glasgow- the following year I travelled alone to another Danish town to sit the entrance exam for the college I wished to attend to, and then took the train to Hamburg to visit a school-friend who was studying there.
Neither her nor my parents thought we were too young to do any of this, nor did any of my parents' friends voice any concerns.
No young person should leave home at 18 to study if they have never been staying anywhere alone.
All they need to stay alone in their own home for a couple of days, is the phone number to the police, fire brigade and ambulance services and to adult friends of their parents whom they can phone if they become scared or run into problems, plus the sense to keep the house doors locked after dark and to disconnect obscene phone calls pronto.
At sixteen I could have married if I had wanted to. I didn't, but more than once if my mother had popped down to the shops, I answered the phone, and on one occasion was so certain when I heard what was wrong that the patient could not wait until my father came in, that I phoned for an ambulance for the patient - and it transpired I was right to do so.