The Empire Strickes Back is a "U" rating here in the UK - meaning universal and suitable for all.
So the same rating as Disney films.
What rating is it in the rest of Europe?
Rating is 12 for Germany, you need to be 12 years or older to see it.
But I noticed there is a video edition of it, with edited/cencored scenes, which is rated 6 (years).
So maybe it's the same in the US or other countries. Nonetheless, my kids wouldn't see any of this at this age.