19 is not underage in the sense of parenting - it is a year into adulthood. Parents are irrelevant by then.
I bet most 19-year olds are still living at home with their parent(s), especially during the summer.
Right. The average 19-year old today has the maturity level of a 15-year old in 1960 - maybe. And half the education. The drinking age in any event is 21. These kids are breaking the law, with the complicity, by absence, of their parents, who apparently believe they have better things to do.