How does the voting age vary worldwide?

Today, Ireland goes to the polls in one of the most unpredictable general elections in years. Over 3.22 million people are eligible to vote and 550 candidates will contest for 157 Dáil seats in 40 constituencies. Our friends over at thejournal.ie took a look at what Irish teenagers would change to make Ireland a better place. The piece featured the below infographic about the voting age worldwide and you can read it here.