Webalthough after the entertainment district arc, including a minor timeskip and several incidents all the way through demon slayer season 3, not much time has. Webwhen we’re first introduced to tanjiro in demon slayer episode one, he’s 13 years old. Demon slaying must age you quickly, though, because by the third episode,. Webtanjiro's kasugai crow directs the three to descend the mountain. Bidding the siblings farewell, they travel to a house, where an elderly woman helps them rest and recover. Webwhen the series started, tanjiro is 13 years old. It was during this age when he found his whole family dead and his remaining sister was turned into a demon. Tanjiro is the main protagonist in demon slayer. Webhowever, throughout demon slayer‘s first and second season, the boy is 15 years old, which is still a very young age for the heavy duties he’s taken on. Webdemon slayer statistics chart. Demon slayer 's anime still has a ways to go before it ends, and as tanjiro's journey continues, he will only meet more and more.