Star Wars: Episode IV A New Hope was originally released in 1977 and has a running time of 125 minutes. Star Wars: Episode V The Empire Strikes Back was released in 1980 and is 135 minutes. Star Wars: Episode VI Return of the Jedi was released in 1983 and has a running time of 130 minutes. All three films have been rated PG by the Motion Picture Association of America and are rated PG in Canada.
I don't think that's misleading, but a warning would be fine.