We tell (employers) to highlight that at the very top of their job description.

My job description is... being enthusiastic.

Do your job; be the best at whatever your job description is.

Voyeurism is a director's job description. It's an artist's, too.

One big knock on teens is that they're not as professional (as adults), but I think that's a generality that can be blown out of proportion. You can teach them the right way the first time. They don't have to unlearn any bad habits.

Don't be too specific about what you want to do. Indicate your interests, but let people know you're willing to try out different opportunities.