noun which may take the genitive case particle 'no', noun
young (especially of a woman); in the bloom of youth; marriageable age
Typically describes a young woman in her prime, often with a nuance of attractiveness or marriageability. Somewhat literary and not used in casual conversation.
彼女は妙齢の女性で、多くの人から注目されていた。
She was a young woman in her prime, attracting attention from many people.
妙齢の娘
Parents with a daughter of marriageable age often become eager about matchmaking.
noun which may take the genitive case particle 'no', noun
charm befitting one's age
Rare usage emphasizing a mature charm appropriate to one's years, rather than youthful beauty. Found in literary or reflective contexts.
彼女には妙齢の魅力があり、若さだけではない美しさを感じさせる。
She has a charm befitting her age, exuding a beauty that is not just about youth.
The exact derivation is uncertain. 妙 (みょう) suggests 'exquisite' or 'wondrous', and 齢 (れい) means 'age', together conveying a sense of a wonderfully youthful age.