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Right now, business casual is THE thing. Basically, nice pants and an open collar, button-up shirt and nice shoes.
As for age, I just finished doing lots of interviews and found that nobody cared about my age (50). If anything it gave a slight edge since the hiring companies wanted truly senior engineers. (I do think it helped that, at least where I live, there is a bubble of sorts of engineers around my age, plus or minus ten years. I probably represent the average age of my current group.)
I am going to go with the suit and tie group on this one.
I wish you luck in your search there in Omaha. I was forced to leave the area a couple of years ago, but have landed nicely just a bit south. Let me know if you would be able/interested in a relocation. I know of a job or two. . . .