Despite appealing to fans of all ages since the late '70s, the Star Wars franchise has definitely had an undeniably kid-friendly bent. Obi-Wan Kenobi's death was mystical and bloodless, George Lucas built an empire from the sale of toys and lunchboxes, and there are a whole lot of Muppets running around these things. The prequels made that reality even harder to deny, with the inescapable suckitude of Jar Jar Binks as exhibits A through Z.
But Rogue One is only the second Star Wars film to earn a PG-13 rating from the MPAA, the only other one being Revenge of the Sith, which featured the pretty violent transformation of Anakin Skywalker into Darth Vader. While Vader's downfall was far from kid-friendly, Episode III still managed to keep things relatively sanitary, featuring off-camera killings and several dismemberments with little blood.
Rogue One, on the other hand, puts the "wars" back in Star Wars. The film's action scenes and themes are violent, and realistic … well, as realistic as you can get when lasers and robots are everywhere. And because literally every main character you meet and come to care about from the film's start goes off to that big moisture farm in the sky, it's safe to say that Rogue One embraced the large contingent of adult fans who've grown up with the franchise, as well as those who've just recently decided to see what all the fuss has been about all these decades. Don't be surprised to see Star Wars movies go even darker in the future.