In German, we have the formal "Sie" and the informal "du". The formal means of address is dying incredibly fast. It's been a huge change just in the past 10 years or so. I'm not a linguist, but I'm pretty sure this is due to the influence of English, which is everywhere.
Just as an example: as a gray-haired professor, I use "du" and my first name with my students. I may be an outlier in my generation, but that is entirely normal for younger colleagues. 10 years ago, that would have been...strange. 20 years ago, it was unheard of.
Just as an example: as a gray-haired professor, I use "du" and my first name with my students. I may be an outlier in my generation, but that is entirely normal for younger colleagues. 10 years ago, that would have been...strange. 20 years ago, it was unheard of.