According to the same statistics, the average age of people living in Newcastle is 37.8 (the national average being 38.6). Many people in the city have Scottish or Irish ancestors. There is a strong presence of Border Reiver surnames, such as Armstrong, Charlton, Elliot, Johnstone, Kerr, Hall, Nixon, Little and Robson. There are also small but significant Chinese, Jewish and Eastern European (Polish, Czech Roma) populations. There are also estimated to be between 500 and 2,000 Bolivians in Newcastle, forming up to 1% of the population—the largest such percentage of any UK city.