I go by the European standard.
Miss (Mlle, Fraulein, Senorita) is for a young woman.
Mrs (Mme, Frau, Senora) is for an adult woman of whatever marital status.
Ms is only if you don't know the name and want to hedge you bets.
I am a gran, divorced, gone back to my original surname, and I use Mrs
Re-naming SS Great Britain tourist attraction
Evidence on Andy Burnham's National Care Service proposals


