Don't people usually address others by their first name these days? Even kids do it but the adult usually tells them to just call them (by their first name). The only time the Mrs/Ms thing came was in school.

Yes, in most places except certain people in the southern US adhere to the custom.  Personally, I don’t like it when a strange woman young enough to be my great grandchild pops her head into the doctor’s waiting room and calls out my first name, as if we were all pals on a first name basis.  If you don’t know how the woman likes to be addressed, use the word Ms. plus my surname, even if it is a bit feminist.  Seriously, it’s nobody’s business in the waiting room, or to the support staff workers what is my first name!  When a person first visits a medical professional and fills out the forms, there should be a line for “preferred manner of address.”  Then, if I change my mind for some reason, (the cardiologist is a wealthy, distinguished older gentleman, at least two years a widower, Traditional Catholic, looking for a female companion for social friendship, possibly more…) we can go to a first name basis!  Okay, only kidding! 

Yes, we had a couple across the street who had been divorced and were "remarried" ... and they were considered pariahs.

It's interesting. Divorce at this time was still something that was looked down on. I knew of friends whose parents were divorced or separated and I felt scandalized and badly for them. Now, it's become a badge of honor.