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Nezuko became a demon after getting attacked by Muzan.
She was only 12 years old when this incident occurred.
Shortly after the incident, she turned into a demon! (Chapter 1 and Chapter 5).
Nezuko’s physical age is 12 years old because she died at that age.
Nezuko’s physical age is 12, while her chronological age is 14.
Nezuko Kamado is known to be only one year younger than her elder brother, Tanjiro Kamado.
I hope you guys cleared out the confusion and found out about Nezuko Kamado in Demon Slayer as much as possible.