DD (almost 6) and ds2 (almost 4) have seen the originals multiple times. There was very little in them that I had any concerns about, and didn't even end up editing. They both love them. (I can't remember what age ds1 was when he saw them.)
DS1 and I have seen the three new ones in the theater. DH hasn't seen the third one. We have no interest in renting them. I don't remember the first two that well, but I would hesitate to let the little ones watch the third one...both the death of the Padawans, and the last fight between Ben and Anakin are a little much, imo. That said...I don't really care, because I didn't like the new ones, anyway.