Use the title for young or old men married or unmarried plus de last name or surname
Mr. (Mister)
Is the common title for a married woman or a widow
Mrs. (Miziz)
This title is for a man when you don´t know his name
Sir
Use this title for a girl, teenager or unmarried young woman plus the last name
Miss
This is a nobility rank title for barons, viscounts and marquesses.
Lord
Use instead of Miss or Mrs when the marital status is unknow or not relevant. Is the most professional.
Ms. (Miz)
This term can now refer to any man of good, courteous conduct. It is only generally used as an honorific form of address in the plural
Gentleman / Gentlemen
Use when you don´t know the name of a girl or young woman
Miss
Use only in addressing a male monarch
Sire (Sair)
Ma'am