Our son, in kindergarden, *loved* the movie, and was only really scared/upset during a brief moment at the end of the pivotal second act (when the town's folk capture Toothless). Given the fast pace, and subject matter (transforming the dragons-to-be-feared into dragons-to-be-friended), I think he's probably at the lower end of the age range of those who would really enjoy the film. It was great fun for his parents, and I highly recommend it for anyone from first-grade up!