woman of mature beauty
Refers to a woman who is past her first youth but still beautiful, often with a nuance of elegance and experience. The term 年増 (としま) can carry a slightly dated or delicate connotation, so use with care.
She is a woman of mature beauty, more attractive than in her youth.
That actress is popular as a woman of mature beauty.
年増 alone means 'mature woman' or 'woman past her prime' and can be pejorative; 年増美人 specifically highlights beauty.
美魔女 is a more modern, trendy term for a woman who looks much younger than her age, often with a glamorous connotation.
Compound of 年増 (としま, 'mature woman') and 美人 (びじん, 'beautiful woman'). The exact historical derivation is uncertain, but the term has been used since at least the Edo period.