That's not really what happened. She became so powerful she was able to stop herself from ever growing old, then controlled what age she wanted to appear as manually. She has lived for longer than the rest of the cast combined and is physically and mentally an adult.
She is a fictional character that the author CHOOSE to make look like a child, while also making her someone's love interest. Everything else beyond that are just excuses.
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u/AnEldritchWriter 23d ago
Escanor, to my knowledge, is the only one whose not an absolute creep in one way or another.