The opening says, "A long time ago, in a galaxy...". So, it is supposed to take place in the past, though in reality, if you travel through in space for, let's say, 10 years, then on Earth 30 years have gone by! But, if it took place in the past, why do they have guns, lasers, and ships capable of interstellar travel? The rules of traveling in space are hard to explain!!! Anyway:
Bottom line: It looks futuristic, but the movie says it took place in the past.