Whatsapp is the number one app in most EU countries. It's not age but the fact youve clearly never socialized outside of your country (or with foreigners).
You couldn't be more wrong. I've lived in Czechia, Poland, the Netherlands, and the UK. I've played go competitively at a European level and have travelled a fair bit and socialized with nerds all over. Name a European country, chances are I know several people there.