Couple of things mista ripsta....
Denver city proper is probably some 5 to 7 miles from the Fitz/Anschutz campus... The streets are layed out in east-west and north-south orientation. It is literally a straight shot down Colfax (east-west) to get downtown where there are many affordable living options. Colfax is probably "the" major east-west street and it runs right by the front door of campus. Plenty and frequent buses run this route... there is a campus stop literally 100 yards from the building in which you will be taking classes. ANd there are student discounts for monthly bus passes. From downtown, you can access anywhere in Denver on buses, free shuttles, and the "subway" system... this includes all sports and music venues, bars, mountain ski shuttles, etc.
As far as "nontrad", it is the first I've heard of that but I am a nontrad and will be a classmate should you choose to attend. I am considerably older than you, and still relatively immature myself
Seriously though, the thing about CU is that everyone here takes part in what recreation the state has to offer. This is a great age equalizer. I have many friends who are considerably younger than myself... rockclimbers, road bikers, skiers, etc.... and of course these are all good bar-hopping buddies. Once you find your niche, you'll find plenty-o-people to hang with.
If you're still concerned, I attended the CU med meet and greet, and almost everyone there was considerably younger than me.
Denver is a great city for your age group. And you are accurate in future prospects for this campus/ school..... When fully completed, it will supposedly be the largest institutional/ private medical bio-park in the world...You would be doing yourself a very grave disservice for choosing not to attend for the reasons you have cited.
See you in August
😉