While he is a “teen”, at 18 he is a legal adult.
While technically true that he is a teen, I never refer to an 18 or 19 year old as a "teen." To me, the teen years are 13-17.
Hope he gets locked up for a long time. Sounds like he ran a sophisticated scheme and anybody saying things like "fraud is fun" while ripping people off needs to do some hard time.