Czech population not oldest in Europe - Prague Daily Monitor The Czech population does not rank among the oldest in Europe for the time being, as the Czech Republic has a larger share of inhabitants aged 15-34 than other European countries, according to the comparison of census results in 24 European states released by the Czech Statistical Office.The largest part of the Czech population - more than 30 percent - is made up of people aged between 15 and 34. This age category makes up 32 percent of the populations of Ireland and Slovakia.