I will tell you a story... if you tell me yours, first.

Mine was travelling by train through France and Spain (return via Portugal) to watch football.

At least I was 20. I met a Swedish bloke on a train in Morocco, who showed me his passport.

I said to him

“You look much younger in that photo”.

He said “No, the passport is still valid.” It later transpired (from discussion in the train carriage from Marrakesh to Tangier) that the photo and passport was issued when he was 12 years old. So, his own child’s passport was still valid (until 18). That summer he had hitchhiked from Sweden through Europe and into Italy, then across the Med to Tunisia and then Algeria to Morocco and then Spain, planning to go home. He was 16 years old.