Webthen, by season 1 episode 22, he confirms that two years have passed, indicating that he is at least 15 years old, going on to 16, in the entertainment district arc since this event.
Webwhile tokito fights through nerves and manifests his demon slayer mark, kokushibo easily cuts off his arm, pinning the hashira to a wall with his own blade.
Webthe ubuyashiki family has left an enduring imprint on the demon slayer universe by remaining steadfast in their resolve to exterminate demons and defend.