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.
Convention on the Rights of Persons with Disabilities
Article 29 requires that all Contracting States protect "the right of persons with disabilities to vote by secret ballot in elections and public referendums". According to this provision, each Contracting State should provide for voting equipment which would enable disabled voters to vote independently and secretly. Some democracies, e.g., the US, Japan, Netherlands, Slovenia, Albania or India allow disabled voters to use electronic voting machines or electronic aides which help disabled voters to fill the paper ballot. In others, among them Azerbaijan, Kosovo, Canada, Ghana, United Kingdom, and most of African and Asian countries, visually impaired voters can use ballots in Braille or paper ballot templates. Many of these and also some other democracies, Chile for example, use adjustable desks so that voters on wheelchairs can approach them. Some democracies only allow another person to cast a ballot for the blind or disabled voter. Such arrangement, however, does not assure secrecy of the ballot.