i am in my 30s, not on any social network (well LinkedIn passively, thinking about closing account after changing job), no Facebook, no Twitter, no Instagram, no Snapchat, etc. and have no problem to communicate with people without Facebook, though since i don't wanna have anything to do with Facebook i am ignoring also WhatsApp, if someone wanna contact me they can use SMS, email, normal call, signal and Skype, this require only two apps installed on my phone
i think many people in Europe share same sentiment especially in world after Snowden, i am just always surprised they are still willing to use WhatsApp owned by Facebook such will soon sharing data, can only hope this will push more people to Signal or back to email or SMS, Skype would be alternative but it's still American company mining data