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Astrid Hofferson is a female Viking warrior of Clan Hofferson of the Hooligan Tribe. She is 15 years old in How to Train Your Dragon, Riders and Defenders of Berk, 18 in Dawn of the Dragon Racers, 18 and 19 in Dragons: Race to the Edge, 20 in How To Train Your Dragon 2, 21 in How to Train Your...