Dress code = No shirt, no shoes, no service. Sorry, that's my smart ass way of saying there is no dress code here.
As for age of the school, I haven't experienced it to be an issue. As I'm sure you're aware, the school is under the same university blanket as CCOM--which has been around for 100 years.
Most of the faculty came here from CCOM--so, as I tell interviewees and potential applicants, it's not like a bunch of people just said, "Well, let's build a med school in the desert." Really, everything runs pretty smoothly here--well, as smoothly as a first year of med school can go. I think the schedule for our class is pretty similar to last year's (I think they increased the number of contact hours that we have to spend in our preceptors' offices during the first two years, but that's about all). I'm not aware of any future curriculum changes--but that, of course, is ALWAYS subject to change (at any school--not just a young one).
The main thing that our class bitches about is percentage grading on our OMM practical exams (one per quarter). I tend to agree that assigning a percentage for a demonstration is probably not a fair way to assess one's abilities, but, in the grand scheme of things, that portion of the grade doesn't end up mattering a lot.
Why did I pick this school? 1) Best interview experience BY FAR of any of the school I was fortunate enough to visit. 2)Facilities--nice and new. 3) Student satisfaction. Everyone I talked to loved it here, and I understand why.
Check out the student run web page:
http://www.azcomstudents.org
The page has lots of good info.--including match list for the first graduating class.
I think it's a wonderful school, and I'm happy with my choice. Investigate all the schools that interview you, and compare. Good luck.