I worked in a company with a lot of 18-25 year olds recently.Based in Barcelona but a very international mix of people. They seemed to do a lot of drinking and a lot of social media (we had a work trip to Rome one weekend and they looked nervous when they didn't have wifi or their phone was out of charge).
As it was a very international crowd out of their home countries and most working in sales maybe it captured a fairly extroverted sample of the age group.
I'm in Berlin, and in my 30s. I'm partying more now than I ever did as a teenager or in my 20s.
This city has a somewhat unique club culture with a bend towards left-wing politics and art (plus electronic music and psychedelics). It's gotten so big that the local government has started to consider the scene economically important, and works to protect the venues from the threats of gentrification.
Festivals (in all of Europe) also seem to be growing every year. Plus there are of course house parties–I don't go as often, but most students I know do every weekend.
