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.