I’m in LA, and my daughter’s friends still call me “Mrs.,” although I’ve begun to tell them to use my first name. (They are college-aged kids).
Although I call my lifelong friends’ parents by their first names in face-to-face conversation, I still use “Mr. And Mrs” when referring to them in conversations with third parties when they are not there. (E.g., saying to a mutual friend, “I saw Mrs. X the other day.” ) Some of these people are like second parents to me but old habits die hard.