I think that builder-grade granite, aka Home Depot type mid range choices, already look dated because they are so common. Very fine grain granite OR the big, rocky, showy "statement" granites are still cool.
As far as general"datedness" and home decor: I live in a Victorian village of 1880's houses. I'll preface this to say that I love these houses as they were built and that's why I am here. So I find that, over 25 years, the most successful houses are those that retain all of the "bones" of the house like crown moldings and original doors and woodwork, fireplace mantels, etc. Floors, when possible (ours here are not very good, they are soft pine and don't hold up to wear) might be original. But decor can be anything because that is, by definition, temporary. I like the look of Victorian houses with modern furnishings, or at least SOME modern stuff.
I still remember the absolute worst decor I ever saw in one of our neighborhood houses. Remember the "Southwest " trend of about 20+ years ago? Yes, someone did up a Victorian in turquoise and brown. Ermagod. It was dated before the paints were even put away. Remembering this trend, I looked at the whole "Tuscany" craze of recent years as something that would be dated by ten.
Be original in your paint colors. Embrace the architectural style of your house. And just know that every ten years or so, the colors and accents will look "dated" unless you go for full-out period restoration, and few people want to do the latter because people don't want to live in a museum.