Electoral system
Electoral rules place limits on suffrage and candidacy. Most countries's electorates are characterised by universal suffrage, but there are differences on the age at which people are allowed to vote, with the youngest being 16 and the oldest 21 (although voters must be 25 to vote in Senate elections in Italy). People may be disenfranchised for a range of reasons, such as being a serving prisoner, being declared bankrupt, having committed certain crimes or being a serving member of the armed forces. Similar limits are placed on candidacy (also known as passive suffrage), and in many cases the age limit for candidates is higher than the voting age. A total of 21 countries have compulsory voting, although in some there is an upper age limit on enforcement of the law. Many countries also have the none of the above option on their ballot papers.
Representative democracy in Singapore
Voting in Singapore is compulsory. Any citizen above 21 years of age who is not disqualified by the factors in section 6 of the Parliamentary Elections Act is required to vote in person. There is no constitutional provision stipulating any qualifications for voters, and as the Act is an ordinary piece of legislation the disqualifying factors may be changed by a simple majority (more than 50%) of votes in Parliament.