I’m from Eastern Europe myself. Yes older folks have accounts, but they aren’t active users. They wouldn’t join groups. They wouldn’t vote in the app. My parents in law are a testament to that. They too have all of those apps, yet they can’t even tell the difference between WhatsApp and Viber. We ask them to call us on WhatsApp and they’ll try to call on viber or Skype and then wonder why we are not answering and if there’s anything wrong with us :)