Congratulations on making it this far in the process. If this is what you believe is truly the right fit for you, continue to pursue them while you wait out the 5 days. Politely, but assertively, reach out to let them know you are still here, interested, and ready.

I also think your age and in their words "inexperience" could be an opportunity for you to play up you energy and coach-ability. The most attractive trait I like in a leader is the ability to be coachable. If you can show them that you have the energy to learn the things you might lack quickly, because you are coachable and willing to take feedback, you might win them over. Being coachable means proactively asking for feedback, then quickly implementing what you've heard, which with you fire for the job, should be no problem.

Hope it goes well!