Demon biology repairs the cellular and genetic damage related to aging.

Muzan cares nothing for his subordinates who.

During the heian era, over a millennium ago, muzan transformed into a demon after an experimental treatment to cure his terminal.

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The drug made muzan age.

Webdespite his fearsome reputation among slayers and demons alike, muzan had an illness that almost took his life in demon slayer, resulting in his intense fear of.

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Webubuyashiki captures muzanโ€™s attention with specifics on how his clan has been cursed because of producing a monster like muzan.

After consulting a priest, they were.

Webmuzan is immortal while kagaya is dying at age 23 (and did so, but in a way that proved instrumental in muzan's final defeat).

By constantly repairing these, he becomes immortal.

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