I'm old, please exploit me...
Perhaps it could be seen as cute (at best) that the successful start-up uses senior citizens as unpaid workers.) Frankly, I think all interns should be paid at least something nominal: the idea of interns working for nothing because they're promised valuable experience, etc, is really just a thin guise for slavery.)
Ben, however, is no ordinary intern. He quickly establishes himself as a superstar of business and teamwork, providing advice and labor that far outstrip even the most highly paid within the company. I kept waiting for someone to acknowledge this glaring form of exploitation (which Ben was ludicrously willing to permit, to the point of staying late with the boss, cleaning up dodgy messes even under the threat of criminal punishment.) When the end rolled around, it was clear no one in the story's universe found his exploitation troubling -- and you know what? I found that troubling!