Comment by anthk

Well, corporation addressing clients would use señor/señora but between older/middle aged men. For anyone under 40 it looks a bit old-fashioned. They would just switch to an 'usted/ustedes' person (formal you/yall, for HN speakers) and no one will feel like they were in 1960.

And even with that, people under 35 will just stay at the informal (normal you) "tu" case.