Have a great time, and remember: it's called 'mile high stadium' for a reason. you old timers need to bring a bottle of oxygen if you plan on walking very far from the parking lot to your seats, or climbing a lot of steps.
I was just in Durango earlier this summer, and it all went well but maaan just walking from the store to my car was more difficult than I ever remembered, and I thought maybe I'm just getting older & out of shape; but then I was like, oh yeah, I'm 6,500 ft above sea level lol. Some health food stores sell small bottles of O2, I'd get one if I was going to this game lol.