That’s like asking Joe Bloggs do you know what WiFi is? Grannies aside most people will know exactly what 5G is, they know what the internet is and WiFi and 4G because they are paying for it..!!
Here in the UK most people can get LTE. Stop thinking about your own country, it’s a global market not a local one..
And you should start thinking globally as well. But I guess it’s okay because you personally have LTE in your country.