This depends if like for tanjiro's age range it would be what you'll look like in the future. But like for giyuu's age group it's what you looked like at like tanjiro's age.
LIFE AND DEATH IN HOLLYWOOD "I don't think kids have a problem with death. It's us older ones who are nearer to it, that start being frightened."
Tanjiro - The Ice Hashira (Older)
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Or
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Zenitsu - The Cloud Hashira (Older)
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Giyuu - The Phantom Hashira (Younger)
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Rengoku - The Floral Hashira (Younger)
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Shinobu - The Moon Hashira (Younger)
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Tengen - The Beauty Hashira (Younger)
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Yushiro - Jellyfish Demon (Older in demon form if demons could age and human form)
No scar
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Human:
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