Vihzel
Destroying Balls Everyday
To this day I don't call anyone older than me by their first name unless they call me by my first name first. I don't just presume to be on a first name basis with someone I've just met. To me that's kind of rude. I expect people in the service industry to address me at Mr. Nonymous for example.
Times are definitely changing with the formalities of names in the U.S. In other countries, like South Korea, not so much. It's becoming more common for adults to call each other by their first names, even in business. Of course it would be polite to refer to a superior as Mr., Mrs., Ms., etc. to be safe until they say it's ok to use the first name.
I remember before going to my friend's Christmas party last year with all of his uncles and aunts there and no one used "aunt" or "uncle". The only familial words used were "grandma" and "grandpa". I was a caught off guard because in my family, it's purely family titles (in Korean, it's not just aunt or uncle as it's more complex depending on age, side of family, and marriage).