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I found it. https://mangadex.org/title/29853/sayonara-no-asa-ni-yakusoku-no-hana-wo-kazarou

I’m looking for a manga centering around a woman who is supposedly the last of her race (elf like?) that causes her to forever remain looking like a child. She then spends years raising a human boy as her own child and they travel. Thank you.