How Old Is Nezuko?

Her age timeline

• Nezuko was 12 years old when her family was attacked and she was turned into a demon by Muzan Kibutsuji.
• The main story then jumps forward about two years (Tanjiro spends that time training). By the time she's actively fighting alongside her brother Tanjiro, she is 14.
• Her older brother Tanjiro is about 15 during the main story (13 at the time of the attack).

A common point of confusion: Because Nezuko became a demon, some fans wonder if she "stopped aging." As a demon, her human aging effectively halts, but in terms of the story's timeline and how her character is counted, she's referred to as 14. Demons in the series don't age normally and can live for a very long time, but Nezuko's stated age reflects her point in the human timeline.

In short: Nezuko is 14 years old for most of Demon Slayer — she was 12 when she was turned into a demon, and roughly two years pass before the main events.

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