(source, voting age is a minimum age established by law that a person must attain to be eligible to vote in a public election)
More on democracy as a human right. It goes without saying that the legal voting age isn’t a good indicator of the quality of democracy in a country. So you can’t use this information to judge whether a country respects the right to democracy. A very high legal voting age – which apparently doesn’t exist anywhere – would exclude large numbers of people from democratic participation. (There are other ways in which countries exclude large numbers of people; see here). On the other hand, there can be countries with a very low voting age but a seriously dysfunctional democracy. More human rights maps.

Thanks for referencing chartsbin.com.
I have updated the map with key now(you can download from ‘Embed’ tab below); also added note for many countries.
Hope you find useful.
Thanks. Readers can find the detailed information here.
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