Compulsory voting
Countries that have compulsory voting by law but do not enforce it:Although voting in a country may be compulsory, penalties for failing to vote are not always strictly enforced. In Australia and Brazil, providing a legitimate reason for not voting (such as illness) is accepted. In Argentina, those who were ill on voting day are excused by requesting a doctor to prove their condition; those over away from their voting place are also excused by asking for a certificate at a police station near where they are. Belgian voters can vote in an embassy if they are abroad or can empower another voter to cast the vote in their name; the voter must give a "permission to vote" and carry a copy of the eID card and their own on the actual elections.
Voting age
Eighteen is the most common voting age, with a small minority of countries differing from this rule. Those with a national minimum age of 17 include East Timor, Greece, Indonesia, North Korea, South Sudan and Sudan. The minimum age is 16 in Argentina, Austria, Brazil, Cuba, Ecuador, Nicaragua and the Isle of Man, Jersey and Guernsey (three self-governing British Crown Dependencies). People aged 16–18 can vote in Bosnia, Serbia and Montenegro if employed. The highest minimum voting age is 21 in several nations. Some countries have variable provision for the minimum voting age, whereby a lower age is set for eligibility to vote in state, regional or municipal elections.