Here is a detailed list of the 10 oldest demons in Demon Slayer: Kimetsu no Yaiba, ranked from youngest to oldest:
- Muzan Kibutsuji: As the progenitor of all demons, Muzan is undoubtedly the oldest and strongest of them all. He has lived for over a thousand years, constantly changing his appearance to avoid detection by demon slayers.
- Kokushibo: Kokushibo was the strongest demon during the Sengoku period of Japan and a direct subordinate of Muzan. He lived for over 400 years and possessed the ability to manipulate time.
- Akaza: Akaza was once a human named Hakuji, who was turned into a demon by Muzan. He has lived for over 300 years and is one of the Twelve Kizuki, the strongest demons in Muzan’s army.
- Doma: Doma is another member of the Twelve Kizuki and has lived for over 300 years. He is known for his sadistic tendencies and enjoys playing with his prey before killing them.
- Gyokko: Gyokko was a skilled magician who became a demon over 300 years ago. He is a member of the Upper Rank demons and possesses the ability to manipulate sound waves.
- Hantengu: Hantengu is a demon who can split into three different personalities, each with its own unique ability. He has lived for over 300 years and is a member of the Upper Rank demons.
- Kaigaku: Kaigaku was once a demon slayer who was turned into a demon by Muzan. He is a member of the Twelve Kizuki and has lived for over 200 years.
- Nakime: Nakime is a demon who possesses the ability to create illusions. She is a member of the Upper Rank demons and has lived for over 200 years.
- Gyutaro: Gyutaro and his sister Daki are demons who work together to devour humans. Gyutaro has lived for over 100 years and possesses the ability to regenerate his body.
- Muzan’s wives: Muzan has had multiple wives over his long life, some of whom have become demons themselves. They have lived for varying lengths of time, but all are likely several centuries old.
Note: The ages and rankings of the demons in this list are based on information from the Demon Slayer manga and anime series
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Kimetsu no Yaiba, Demon Slayer, Mitsuri, Tanjiro, Muchiro, Iguro