Originally Posted by
AjedrecístaBritánico
I have never read about such a rule at all. I myself am 19 years old and planning to go to Bs. As. next year, when I will be 20,75 years old, and after researching my plans never came across such a rule about entry.
You are unlikely to have a problem. Of the 18-21 year old US and UK nationals I know to have flown to Argentina by themselves, none had problems with immigration on arrival or departure.