Data from the EU’s statistical office, Eurostat, showed that in 2017 Lisbon had an old-age-dependency ratio of 41.4 percent, being the oldest capital city in the EU.

This percentage was also higher than the EU average, which was 33 percent.

Among the European capitals with older population compared to the working-age population (between 20 and 64) was also Rome (with a ratio of 36.4percent) and the capital of Malta, Valletta (33.5 percent).

Conversely, in 2017, the capital with the highest young-age dependency ratio (the ratio of people under 19 compared to the working-age population) was Brussels (40.2 percent).

Paris and Dublin were also among the youngest, with ratios of 39.2 percent and 39.1 percent respectively.