France has officially dropped Mademoiselle from the lexicon, as there is no equivalent for young men. Abbreviated Mlle., the term was often used to imply a woman’s unmarried state; symbolically, her virginal or simply youthful state.
But there is no equivalent for men, as “monsieur” is used for married & unmarried (& we assume, virginal and sexually experienced) men.
Long overdue, in my opinion, but it’s great to see this change codified.