A solid read, but may be a bit slow for younger readers. Sex: None (no issue) Violence: Dinosaurs fight in distance of the threesome. A hurricane is tense. The characters almost die of thirst (no issue). Social Behavior: Professor Lidenbrock seems to have no regard for his safety or for that of his companions (safety as in not turning back when they ran out of water) and is portrayed as a little insane(not issue) Alcohol/Drugs: The adventurers take gin with them as their only liquid, expecting to find an underwater stream, Professor Lidenbrock smokes a pipe. (pause) Educational Value: They travel to a place that does not exist, and the book was written with scientific self-assuredly. No-one can survive being inside an active volcano. Also, Verne made many mistakes geographically and geologically when pointing out facts, for example, he mistook the island farthest to the West from Iceland as the one farthest to the East (these are pointed out in the version I got, but maybe not in yours) (PAUSE) Overall: Mature 11-12+ normal 13+ immature or impatient 14-15+. However these ages are just because younger readers would get bored, or not understand it.