My guess is not likely at the airlines unless the state of the industry changes dramatically. Airline employers are pretty tolerant of youthful indiscretions on the part of pilot applicants...peeing in public, drunk in public, underage drinking, etc.
But that is all relatively harmless stuff...when you start getting into crimes which have victims (DUI, theft, assault, etc) airlines are about 100% intolerant.
The one shot this guy has is to go 91/135/corporate and work his way up. His history will exclude him from the better corporate and 135 jobs too, but he should be able to get something. Since this incident occurred at a young age he MIGHT be able to overcome it after a long stretch (15-20 years?) of clean living and safe flying. Maybe, it's just hard to say.
It would be better if he had been 14 when it happened...but 19 = adult. Bottom line, this is a very serious thing to have on your record.